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contactlenses.co.uk

contactlenses.co.uk is SSL secured

Free website and domain report on contactlenses.co.uk

Last Updated: 21st November, 2020 Update Now
Overview

Snoop Summary for contactlenses.co.uk

This is a free and comprehensive report about contactlenses.co.uk. Contactlenses.co.uk has the potential to be earning an estimated $12 USD per day from advertising revenue. If contactlenses.co.uk was to be sold it would possibly be worth $8,424 USD (based on the daily revenue potential of the website over a 24 month period). Contactlenses.co.uk is quite popular with an estimated 4,044 daily unique visitors. This report was last updated 21st November, 2020.

About contactlenses.co.uk

Site Preview: contactlenses.co.uk contactlenses.co.uk
Title: Contact Lenses UK | Cheap and comfortable contact lenses | Contactlenses.co.uk
Description: Buy high quality comfortable contact lenses and solutions online. The UK's number 1 independent supplier of contact lenses. Free UK delivery on all orders over £30.
Keywords and Tags: contactlenses.co.uk, online shopping
Related Terms: contact dermatitis picture, el bilad tv contact, extreme tracker contact number, fortuneo contact telephone, instalens lenses, most comfortable sandals, orange contact, ozsale contact number australia, pickaflick contact number, travelguru contact
Fav Icon:
Age: Over 26 years old
Domain Created: 14th April, 1997
Domain Updated: 20th June, 2020
Domain Expires: 14th April, 2021
Review

Snoop Score

3/5 (Great!)

Valuation

$8,424 USD
Note: All valuation figures are estimates.

Popularity

Modest
Note: Popularity is estimated.

Rank, Reach and Authority

Alexa Rank: 154,428
Alexa Reach:
SEMrush Rank (US):
SEMrush Authority Score:
Moz Domain Authority: 0
Moz Page Authority: 0

Organic vs Paid (Google Ads)

Traffic

Visitors

Daily Visitors: 4,044
Monthly Visitors: 123,087
Yearly Visitors: 1,476,060
Note: All visitors figures are estimates.

Visitors By Country

Revenue

Revenue

Daily Revenue: $12 USD
Monthly Revenue: $351 USD
Yearly Revenue: $4,207 USD
Note: All revenue figures are estimates.

Revenue By Country

SEO

Backlinks Analysis (SEMrush)

Top New Follow Links

Top Ranking Keywords (US)

Domain Analysis

Value Length
Domain: contactlenses.co.uk 19
Domain Name: contactlenses 13
Extension (TLD): couk 4
Expiry Check:

Page Speed Analysis

Average Load Time: 1.54 seconds
Load Time Comparison: Faster than 57% of sites

PageSpeed Insights

Avg. (All Categories) 62
Performance 70
Accessibility 76
Best Practices 64
SEO 83
Progressive Web App 19
0–49 (Fail) 50–89 (Average) 90–100 (Pass)
URL: https://www.contactlenses.co.uk/
Updated: 21st November, 2020

1.50 seconds
First Contentful Paint (FCP)
42%
51%
7%

0.01 seconds
First Input Delay (FID)
99%
1%
0%

Simulate loading on desktop
70

Performance

Indicates how well the page is performing and highlights opportunities where performance may be improved for contactlenses.co.uk. This includes details about optimizing page load times which can result in a better user experience.

Metrics

First Contentful Paint — 0.8 s
The time taken for the first image or text on the page to be rendered.
Total Blocking Time — 150 ms
The total blocking time is the sum of all time periods between First Contentful Paint and Time to Interactive (when task length exceeded 50ms).
Cumulative Layout Shift — 0.003
Cumulative Layout Shift is the measurement of visible elements collective movement within the viewport.
View Data

Other

First CPU Idle — 2.4 s
The time taken for the page's main thread to be quiet enough to handle input.
First Meaningful Paint — 0.8 s
The time taken for the primary content of the page to be rendered.
Estimated Input Latency — 20 ms
The time taken for the page to respond to user input (during the busiest 5 second window of page load). Users are likely to perceive contactlenses.co.uk as laggy when the latency is higher than 0.05 seconds.
Network Requests
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Network Round Trip Times — 0 ms
High Network RTT (Round Trip Times) can have a large impact on performance. Providing servers geographically closer to the user could improve performance.
Server Backend Latencies — 0 ms
High server latencies indicate the server is overloaded or has a poor backend performance.
Tasks
Below is a list of the top-level main thread tasks that executed during page load.
Start Time (Ms) End Time (Ms)
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11.531
3114.134
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28.427
3399.69
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3438.671
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6.32
3483.235
28.983
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3533.25
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3598.747
17.131
3617.461
5.659
3674.418
8.362
4243.266
49.711
4294.749
20.219
4315.05
62.442
4377.624
14.895
4403.022
27.257
Diagnostics
Below is a collection of useful page vitals.
View Data
Metrics
Below is a collection of metrics.
View Data

Opportunities

Properly size images — Potential savings of 92 KiB
Images can slow down the page's load time. Contactlenses.co.uk should consider serving more appropriate-sized images.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://www.contactlenses.co.uk/data/education/educmspages/146.png
43883
40534
https://res2.contactlenses.co.uk/images/banner/home-big-banner-2.jpg
48355
26931
https://res2.contactlenses.co.uk/data/hotoffer/156.jpg
16649
8627
https://res2.contactlenses.co.uk/data/hotoffer/109.jpg
13123
6800
https://res2.contactlenses.co.uk/images/trustpilot-logo.jpg
7920
6065
https://res2.contactlenses.co.uk/data/hotoffer/103.jpg
9961
5161
Defer offscreen images
Time to Interactive can be slowed down by resources on the page. Contactlenses.co.uk should consider lazy-loading offscreen and hidden images.
Minify CSS
Cascading Style Sheets (CSS) files can contribute to network payload sizes. Contactlenses.co.uk should consider minifying CSS files.
Minify JavaScript — Potential savings of 8 KiB
JavaScript (JS) files can contribute to network payload sizes and increase script parse times. Contactlenses.co.uk should consider minifying JS files.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://res2.contactlenses.co.uk/assets/c33966bf/yii.activeForm.js
7533
4518
https://res2.contactlenses.co.uk/assets/c33966bf/yii.js
6181
3876
Remove unused CSS — Potential savings of 41 KiB
Dead and/or unused rules in Style Sheets (CSS) can contribute to network payload sizes. Contactlenses.co.uk should consider removing dead rules from style sheets and deferring the loading of CSS not used for above-the-fold content.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://res2.contactlenses.co.uk/css/css-ALL.min.css
49227
42327
Efficiently encode images — Potential savings of 19 KiB
Unoptimized images can consume more cellular data than what is necessary.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://res2.contactlenses.co.uk/data/images/large/190.jpg
52060
14070
https://res2.contactlenses.co.uk/images/brand/3.jpg
8572
5335
Serve images in next-gen formats — Potential savings of 66 KiB
Image formats like PNG and JPEG have poor compression when compared to other next-gen formats, such as JPEG 200, JPEG XR and WebP.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://res2.contactlenses.co.uk/data/images/large/190.jpg
52060
37526
https://www.contactlenses.co.uk/data/education/educmspages/146.png
43883
30151
Enable text compression
Text-based resources should be served with compression, such as gzip, deflate or brotli.
Preconnect to required origins
Resource hints, such as 'preconnect' or 'dns-prefetch', may assist in establishing early connections to important third-party origins.
Avoid multiple page redirects — Potential savings of 190 ms
Redirects can cause additional delays before the page can begin loading. Contactlenses.co.uk should avoid multiple or unnecessary page redirects.
URL Time Spent (Ms)
http://contactlenses.co.uk/
190
https://www.contactlenses.co.uk/
0
Remove duplicate modules in JavaScript bundles
Ensure that no duplicate JavaScript modules from bundles exist to reduce bytes consumed by network activity.
Avoid serving legacy JavaScript to modern browsers — Potential savings of 26 KiB
Polyfills and transforms enable legacy browsers to use new JavaScript features. For bundled JavaScript it is recommended to adopt a modern script deployment strategy using module/nomodule feature detection. This will reduce the amount of code shipped to modern browsers.
URL Potential Savings (Bytes)
https://connect.facebook.net/signals/config/689952134759816?v=2.9.29&r=stable
11990
https://www.clickcease.com/monitor/stat.js
10753
https://assets.flex.twilio.com/releases/flex-webchat-ui/2.4.0/twilio-flex-webchat.min.js
3535
https://widget.trustpilot.com/bootstrap/v5/tp.widget.bootstrap.min.js
77
https://widget.trustpilot.com/trustboxes/54ad5defc6454f065c28af8b/main.js
77
https://res2.contactlenses.co.uk/assets/5ffe6807/js/tether.min.js
58
https://connect.facebook.net/en_US/fbevents.js
45
https://res2.contactlenses.co.uk/assets/7eced2f2/js/bootstrap.min.js
44

Diagnostics

Avoids enormous network payloads — Total size was 2,083 KiB
Large network payloads can cost users money and are linked to long load times.
URL Transfer Size (Bytes)
https://assets.flex.twilio.com/releases/flex-webchat-ui/2.4.0/twilio-flex-webchat.min.js
535292
https://res2.contactlenses.co.uk/data/hotoffer/155.gif
521201
https://res2.contactlenses.co.uk/fonts/fontawesome-webfont.woff2?v=4.7.0
77794
https://connect.facebook.net/signals/config/689952134759816?v=2.9.29&r=stable
71586
https://res2.contactlenses.co.uk/assets/235a363c/jquery-ui.min.js
68438
https://res2.contactlenses.co.uk/data/images/large/190.jpg
52367
https://res2.contactlenses.co.uk/css/css-ALL.min.css
49227
https://widget.trustpilot.com/trustboxes/54ad5defc6454f065c28af8b/main.js
48689
https://res2.contactlenses.co.uk/images/banner/home-big-banner-2.jpg
48662
https://www.contactlenses.co.uk/data/education/educmspages/146.png
44235
Avoid chaining critical requests — 14 chains found
Below is a list of Critical Request Chains, which shows which resources are loaded with a high priority. Contactlenses.co.uk should consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.
User Timing marks and measures
Make use of the User Timing API to measure an app's real-world performance during key user experiences.
JavaScript execution time — 0.4 s
JavaScript (JS) execution time can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
URL Total CPU Time (Ms) Script Evaluation (Ms) Script Parse (Ms)
https://assets.flex.twilio.com/releases/flex-webchat-ui/2.4.0/twilio-flex-webchat.min.js
348.907
312.905
31.288
https://www.contactlenses.co.uk/
336.781
29.311
2.236
Unattributable
109.676
2.289
0.208
https://widget.trustpilot.com/trustboxes/54ad5defc6454f065c28af8b/main.js
93.81
50.331
2.616
Minimizes main-thread work — 1.2 s
Main-thread work timing can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
Category Time Spent (Ms)
Script Evaluation
606.97499999999
Style & Layout
180.125
Other
138.588
Rendering
95.853
Script Parsing & Compilation
66.868
Parse HTML & CSS
62.624
Garbage Collection
24.533
Keep request counts low and transfer sizes small — 79 requests • 2,083 KiB
It is advised to add a budgets.json file in order to set budgets for the quantity and size of page resources.
Resource Type Requests Transfer Size (Bytes)
Total
79
2132504
Image
41
990544
Script
24
976862
Font
2
87494
Stylesheet
2
50871
Document
3
19406
Other
7
7327
Media
0
0
Third-party
27
861158
Minimize third-party usage — Third-party code blocked the main thread for 0 ms
It is advised to either limit, remove or delay the loading of redundant third-party code which may be significantly impacting load performance.
Third-Party Transfer Size (Bytes) Main-Thread Blocking Time (Ms)
SHOW DETAILS
96655
0
SHOW DETAILS
78950
0
SHOW DETAILS
63266
0
SHOW DETAILS
20084
0
SHOW DETAILS
17206
0
SHOW DETAILS
11344
0
SHOW DETAILS
9430
0
SHOW DETAILS
2737
0
SHOW DETAILS
746
0
Largest Contentful Paint element — 1 element found
The element which was identified as the Largest Contentful Paint.
Element
Hot offer
Avoid large layout shifts — 5 elements found
Below is a list of all DOM elements that contribute to the CLS of the page.
Element CLS Contribution
Covid-19 - We are shipping as normal, however, there may be a delay with some c…
0.0018727209172188
VIEW AND BUY
0.00020936808489902
VIEW AND BUY
0.00020936808489902
VIEW AND BUY
0.00020936808489902
VIEW AND BUY
0.00020812184629843
Avoids `document.write()`
Avoid or limit the use of external scripts that are dynamically injected via 'document.write()' as users on slow connections will be delayed by tens of seconds.
Avoid long main-thread tasks — 2 long tasks found
Below is a list of the longest tasks on the main thread, which is useful when identifying the worst input delay contributors.
URL Start Time (Ms) Duration (Ms)
https://widget.trustpilot.com/bootstrap/v5/tp.widget.bootstrap.min.js
2730
328
https://assets.flex.twilio.com/releases/flex-webchat-ui/2.4.0/twilio-flex-webchat.min.js
3075
62
Avoid non-composited animations
It is recommended to avoid non-composited animations which are often janky and increase CLS.
Avoids large JavaScript libraries with smaller alternatives — 0 large libraries found
It is recommended to work with smaller JavaScript libraries to reduce your bundle size and avoid poor performance.

Budgets

Performance budget
It is advised to keep the quantity and size of all network requests under the targets set by the provided performance budget.
Timing budget
It is advised to set a timing budget to monitor the performance of your site.

Metrics

Time to Interactive — 2.8 s
The time taken for the page to become fully interactive.

Opportunities

Eliminate render-blocking resources — Potential savings of 270 ms
Resources, such as JavaScript and style sheets, can block the first paint of the page. Contactlenses.co.uk should consider delivering critical JavaScript/style sheets (JS/CSS) inline and deferring all non-critical JS/CSS.
URL Transfer Size (Bytes) Potential Savings (Ms)
https://res2.contactlenses.co.uk/css/css-ALL.min.css
49227
310
Remove unused JavaScript — Potential savings of 429 KiB
It is advised to remove unused JavaScript in order to reduce bytes consumed by network activity.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://assets.flex.twilio.com/releases/flex-webchat-ui/2.4.0/twilio-flex-webchat.min.js
535292
281528
https://res2.contactlenses.co.uk/assets/235a363c/jquery-ui.min.js
68438
59558
https://connect.facebook.net/signals/config/689952134759816?v=2.9.29&r=stable
71586
54129
https://www.googletagmanager.com/gtag/js?id=AW-592711747&l=dataLayer&cx=c
39475
22161
https://www.googletagmanager.com/gtag/js?id=UA-227300-2
39475
21490
Preload key requests — Potential savings of 550 ms
Key requests can be preloaded by using '<link rel=preload>'. Contactlenses.co.uk should consider using '<link rel=preload>' to prioritize fetching resources that are currently requested later in page load.
URL Potential Savings (Ms)
https://res2.contactlenses.co.uk/fonts/fontawesome-webfont.woff2?v=4.7.0
550
Use video formats for animated content — Potential savings of 336 KiB
Large GIFs are inefficient for delivering animated content. It is recommended to use MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://res2.contactlenses.co.uk/data/hotoffer/155.gif
520893
343789

Diagnostics

Avoid an excessive DOM size — 1,040 elements
A large DOM (Document Object Model) will increase memory usage, cause longer system calculations as well as costly layout reflows.
Statistic Element Value
Total DOM Elements
1,040
Maximum DOM Depth
SHOW DETAILS
17
Maximum Child Elements
SHOW DETAILS
29

Metrics

Speed Index — 2.4 s
The time taken for the page contents to be visibly populated.
Largest Contentful Paint — 3.1 s
The timing of the largest text or image that is painted.

Other

Max Potential First Input Delay — 330 ms
Users could experience a delay when interacting with the page.

Opportunities

Reduce initial server response time — Root document took 880 ms
It is advised to keep the server response time short for the main document, because all other requests depend on it.
URL Time Spent (Ms)
https://www.contactlenses.co.uk/
875.063

Diagnostics

Serve static assets with an efficient cache policy — 58 resources found
Contactlenses.co.uk can speed up repeat visits by increasing the cache lifetime, which is essentially how long before a cached copy expires.
URL Cache TTL (Ms) Transfer Size (Bytes)
https://assets.flex.twilio.com/releases/flex-webchat-ui/2.4.0/twilio-flex-webchat.min.js
0
535292
https://certify.alexametrics.com/atrk.gif?frame_height=940&frame_width=1350&iframe=0&title=Contact%20Lenses%20UK%20%7C%20Cheap%20and%20comfortable%20contact%20lenses%20%7C%20Contactlenses.co.uk&time=1606000378357&time_zone_offset=480&screen_params=800x600x24&java_enabled=0&cookie_enabled=1&ref_url=&host_url=https%3A%2F%2Fwww.contactlenses.co.uk%2F&random_number=10673850647&sess_cookie=336ac731175ed1501f34686e2ca&sess_cookie_flag=1&user_cookie=336ac731175ed1501f34686e2ca&user_cookie_flag=1&dynamic=true&domain=contactlenses.co.uk&account=Cyhlv1DlQy20Y8&jsv=20130128&user_lang=en-US
0
550
https://connect.facebook.net/signals/config/689952134759816?v=2.9.29&r=stable
1200000
71586
https://connect.facebook.net/en_US/fbevents.js
1200000
24606
https://www.google-analytics.com/analytics.js
7200000
19452
https://widget.trustpilot.com/trustboxes/54ad5defc6454f065c28af8b/main.js
86400000
48689
https://widget.trustpilot.com/bootstrap/v5/tp.widget.bootstrap.min.js
86400000
7274
https://res2.contactlenses.co.uk/data/hotoffer/155.gif
2592000000
521201
https://res2.contactlenses.co.uk/fonts/fontawesome-webfont.woff2?v=4.7.0
2592000000
77794
https://res2.contactlenses.co.uk/assets/235a363c/jquery-ui.min.js
2592000000
68438
https://res2.contactlenses.co.uk/data/images/large/190.jpg
2592000000
52367
https://res2.contactlenses.co.uk/css/css-ALL.min.css
2592000000
49227
https://res2.contactlenses.co.uk/images/banner/home-big-banner-2.jpg
2592000000
48662
https://www.contactlenses.co.uk/data/education/educmspages/146.png
2592000000
44235
https://res2.contactlenses.co.uk/assets/1d68f126/jquery.min.js
2592000000
30558
https://res2.contactlenses.co.uk/data/hotoffer/158.jpg
2592000000
28255
https://res2.contactlenses.co.uk/data/hotoffer/100.jpg
2592000000
23832
https://res2.contactlenses.co.uk/data/images/large/3.jpg
2592000000
19134
https://res2.contactlenses.co.uk/data/images/large/141.jpg
2592000000
17219
https://res2.contactlenses.co.uk/data/images/large/41.jpg
2592000000
17064
https://res2.contactlenses.co.uk/data/hotoffer/156.jpg
2592000000
16956
https://res2.contactlenses.co.uk/data/images/large/189.jpg
2592000000
16444
https://res2.contactlenses.co.uk/data/images/large/145.jpg
2592000000
16342
https://res2.contactlenses.co.uk/data/images/large/167.jpg
2592000000
16281
https://res2.contactlenses.co.uk/images/nav-bg-3.jpg
2592000000
14239
https://res2.contactlenses.co.uk/data/hotoffer/109.jpg
2592000000
13430
https://res2.contactlenses.co.uk/assets/7eced2f2/js/bootstrap.min.js
2592000000
12410
https://res2.contactlenses.co.uk/data/images/large/152.jpg
2592000000
11963
https://res2.contactlenses.co.uk/data/hotoffer/116.jpg
2592000000
10522
https://res2.contactlenses.co.uk/images/gd2.gif
2592000000
10461
https://res2.contactlenses.co.uk/data/hotoffer/103.jpg
2592000000
10267
https://res2.contactlenses.co.uk/images/brand/3.jpg
2592000000
8878
https://res2.contactlenses.co.uk/images/trustpilot-logo.jpg
2592000000
8226
https://res2.contactlenses.co.uk/assets/5ffe6807/js/tether.min.js
2592000000
7760
https://res2.contactlenses.co.uk/images/youtube.jpg
2592000000
7730
https://res2.contactlenses.co.uk/assets/c33966bf/yii.activeForm.js
2592000000
7533
https://res2.contactlenses.co.uk/images/brand/12.jpg
2592000000
7016
https://res2.contactlenses.co.uk/images/brand/1.jpg
2592000000
6763
https://res2.contactlenses.co.uk/assets/c33966bf/yii.js
2592000000
6181
https://res2.contactlenses.co.uk/images/brand/acuvue.png
2592000000
6143
https://res2.contactlenses.co.uk/images/logo-footer.png
2592000000
5644
https://res2.contactlenses.co.uk/images/brand/25.jpg
2592000000
5217
https://res2.contactlenses.co.uk/limages/contact-lenses-co-uk-logo.gif
2592000000
4738
https://res2.contactlenses.co.uk/images/partner/partner-4.jpg
2592000000
4224
https://res2.contactlenses.co.uk/images/brand/ciba.jpg
2592000000
4095
https://res2.contactlenses.co.uk/assets/c33966bf/yii.validation.js
2592000000
3391
https://res2.contactlenses.co.uk/images/brand/5.jpg
2592000000
2806
https://res2.contactlenses.co.uk/images/icon-security.png
2592000000
1856
https://res2.contactlenses.co.uk/js/jquery.cookie.js
2592000000
1742
https://res2.contactlenses.co.uk/images/basket.png
2592000000
1631
https://res2.contactlenses.co.uk/images/icon-baggage.png
2592000000
1549
https://res2.contactlenses.co.uk/images/icon-cash.png
2592000000
1549
https://res2.contactlenses.co.uk/js/cookieList.js
2592000000
1024
https://res2.contactlenses.co.uk/js/jquery.ui.autocomplete.html.js
2592000000
944
https://res2.contactlenses.co.uk/images/star.svg
2592000000
824
https://res2.contactlenses.co.uk/images/star-full-active.svg
2592000000
724
https://res2.contactlenses.co.uk/js/cl.js
2592000000
621
https://www.clickcease.com/monitor/stat.js
2678400000
23557
Ensure text remains visible during webfont load
Make use of the font-display CSS feature, which will ensure text is user-visible while webfonts are loading.
URL Potential Savings (Ms)
https://res2.contactlenses.co.uk/fonts/fontawesome-webfont.woff2?v=4.7.0
1009.0809999965
https://fonts.gstatic.com/s/opensans/v18/mem8YaGs126MiZpBA-UFVZ0bf8pkAg.woff2
2.4110000231303
Does not use passive listeners to improve scrolling performance
Improve the page's scroll performance by marking touch and wheel event listeners as 'passive'.
URL Location
https://widget.trustpilot.com/trustboxes/54ad5defc6454f065c28af8b/main.js
line: 0
76

Accessibility

Indicates how accessible the page is and highlights opportunities where the page can be made more accessible to users of contactlenses.co.uk. This includes details about various page attributes that can be optimized.

Navigation

`[accesskey]` values are unique
Access keys assist users with focusing on different parts of the page. Each access key should be unique for proper navigation.
The page contains a heading, skip link, or landmark region
It is advised to provide ways to bypass repetitive content, allowing users to navigate the page efficiently.
`[id]` attributes on active, focusable elements are unique
Ensure all focusable elements have a unique id value to allow them to be visible to users of assistive technologies, like a screen reader.
No element has a `[tabindex]` value greater than 0
Although technically valid, a tabindex value greater than 0 often creates frustrating experiences for users who rely on assistive technologies.

ARIA

`[aria-*]` attributes match their roles
Avoid mismatching 'aria-*' attributes and their 'role' value, as it invalidates the attribute.
`[aria-hidden="true"]` is not present on the document `<body>`
If aria-hidden=true is set on the document body, assistive technologies, like a screen reader will work inconsistently.
`[aria-hidden="true"]` elements do not contain focusable descendents
Interactive elements within an aria-hidden=true element are unavailable to users of assistive technologies, like a screen reader.
`[role]`s have all required `[aria-*]` attributes
Some ARIA roles have required 'aria-*' attributes, which provide essential information about state and functionality.
`[role]`s are contained by their required parent element
Some ARIA child roles cannot perform their intended functions if specific parent roles are not used.
`[role]` values are valid
All ARIA roles require valid values to perform their intended functions.
ARIA toggle fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when a toggle field does not have an accessible name specified.
`[aria-*]` attributes have valid values
ARIA attributes cannot be interpreted with invalid values when used by screen readers and other assistive technologies.
`[aria-*]` attributes are valid and not misspelled
ARIA attributes cannot be interpreted with invalid names when used by screen readers and other assistive technologies.
ARIA IDs are unique
Ensure all ARIA ID values are unique to prevent elements from being overlooked by assistive technologies, like a screen reader.

Tables and lists

`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Screen readers and other assistive technologies may produce poor and inaccurate output when definition lists are not properly marked up.
Definition list items are wrapped in `<dl>` elements
In order for screen readers and other assistive technologies to properly announce definition list items ('<dt>' and '<dd>'), they must be wrapped in parent a '<dl>' element.
Presentational `<table>` elements avoid using `<th>`, `<caption>` or the `[summary]` attribute.
It is advised to not include data elements in tables which are used for layout purposes, as it may create confusion for screen reader and other assistive technology users.
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Use proper list structure to aid screen readers and other assistive technologies.
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
In order for screen readers to announce list items, ensure that list items ('<li>') are contained within parent '<ul>' or '<ol>' tags.
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that '<td>' cells using the headers attribute only refer to other cells in the same table, to improve screen reader user experience.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that table headers refer to some set of cells, to improve screen reader user experience.

Names and labels

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
No form fields have multiple labels
Having multiple labels for form fields can be confusing to assistive technologies, like a screen reader.
`<frame>` or `<iframe>` elements have a title
Screen reader users and other assistive technology users rely on frame titles to describe the contents of frames.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
`<input type="image">` elements have `[alt]` text
Input buttons with alternative text assist screen readers and other assistive technology users to understand its purpose.
`<object>` elements have `[alt]` text
It is advised that alt text is used on '<object>' elements in order to provide meaning to screen reader and other assistive technology users, as these technologies are unable to translate non-text content.

Internationalization and localization

`<html>` element has a `[lang]` attribute
It is advised to provide a lang attribute so that screen readers and other assistive technologies are guaranteed to announce the page's text correctly. When not provided, the user's default language setting will be used which may cause inaccuracies.
`<html>` element has a valid value for its `[lang]` attribute
Specify a valid BCP 47 language in order to help screen readers and other assistive technologies announce text properly.
`[lang]` attributes have a valid value
Specify a valid BCP 47 language on elements in order to help screen readers and other assistive technologies announce text properly.

Best practices

The document does not use `<meta http-equiv="refresh">`
Pages that refresh automatically cause a poor user experience as focus is directed back to the top of the page unexpectedly.
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
For users with low vision who rely on screen magnification, ensure that zooming is not disabled.

Audio and video

`<video>` elements contain a `<track>` element with `[kind="captions"]`
Contactlenses.co.uk may provide assistance to deaf or hearing-impaired users with captions on videos.
`<video>` elements contain a `<track>` element with `[kind="description"]`
Contactlenses.co.uk may provide relevant information that dialogue cannot, by using audio descriptions.

ARIA

ARIA input fields do not have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when an input field does not have an accessible name specified.
Failing Elements
Hot offer
Elements with an ARIA `[role]` that require children to contain a specific `[role]` are missing some or all of those required children.
Some ARIA parent roles cannot perform their intended functions if specific child roles are not used.
Failing Elements
Hot offer

Names and labels

Buttons do not have an accessible name
Buttons become unusable as they are announced simply as "button" when the button does not have an accessible name, when used by screen readers and other assistive technologies.
Failing Elements
button
Form elements do not have associated labels
Screen readers and other assistive technologies rely on labels to properly announce form controls.
Failing Elements
input
Links do not have a discernible name
In order to improve the navigation for screen reader and other assistive technology users, use link text that is unique, focusable and discernible.

Contrast

Background and foreground colors do not have a sufficient contrast ratio.
Many (if not most) users find low-contrast text difficult or impossible to read.
Failing Elements
0345 319 3000
CONTACT LENSES
OTHER PRODUCTS
SUNGLASSES
CONTACT US
HELP
REORDER
LOGIN
Covid-19 - We are shipping as normal, however, there may be a delay with some c…
click here
Show All
.99
.50
.00
.75
.99
.75
.99
.50
Free shipping on UK orders over £30
When you refer your friends
100% protected by SecurityMetrics
Overview
Personal details
Delivery address
Preferences
My orders
Reorder
About Us
Delivery Information
Returns and Refunds Policy
Sitemap
Help
Contact us
Affiliate Program
Eyecare
Covid 19
Buy Daysoft Replacement Lenses?
Are My Lenses in Stock?
Can I Recycle Contact Lenses?
Do You Stock Own Brand (Opticians) Lenses?
How Do I Read My Prescription
Where`s My Order?
Why Are Your Prices Lower Than My Opticians?
Returning Items?
Customer Testimonials
Why Choose Us? Top 10 Reasons!
Chat with us

Navigation

Heading elements are not in a sequentially-descending order
Properly order all headers and do not skip heading levels to better the navigation and readability for users of assistive technologies, like a screen reader.
Failing Elements
About Us

Manual Checks

The page has a logical tab order
The visual layout should be logical in its tab order and users cannot focus elements that are offscreen.
Interactive controls are keyboard focusable
Ensure that custom interactive controls are keyboard focusable and that a focus indicator is displayed.
Interactive elements indicate their purpose and state
Ensure that interactive elements (such as links and buttons) are distinguishable from non-interactive elements and that they indicate their state.
The user's focus is directed to new content added to the page
When new content (such as a dialogue) is added to the page, the user's focus should be directed to it.
User focus is not accidentally trapped in a region
Avoid focus being accidentally trapped when a user tabs in and out of controls or regions on page.
Custom controls have associated labels
Ensure that custom interactive controls have associated labels, which are provided by aria-label and aria-labelledby attributes.
Custom controls have ARIA roles
Ensure that all custom interactive controls have appropriate ARIA roles.
Visual order on the page follows DOM order
Ensure that the DOM order matches with the page's visual order, in order to improve navigation for screen readers and other assistive technologies.
Offscreen content is hidden from assistive technology
Ensure that offscreen content is hidden through the use of "display:none" styling or the aria-hidden attribute.
HTML5 landmark elements are used to improve navigation
Elements such as <main> and <nav> are recommended as they are used by screen readers and other assistive technologies to improve keyboard navigation.
64

Best Practices

Indicates the recommended, best practices currently in place on the page and highlights the best practices that contactlenses.co.uk should incorporate. This includes practices such as protecting pages with HTTPS.

Audits

Avoids requesting the geolocation permission on page load
When requesting a user's location, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids requesting the notification permission on page load
When requesting permission to send notifications, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.

Audits

Allows users to paste into password fields
Ensure that password inputs may be pasted into to aid in the user's ability to use password managers and improve security.
Displays images with correct aspect ratio
Ensure that image display dimensions match their natural aspect ratio.
Serves images with appropriate resolution
For maximum image clarity, ensure images have natural dimensions and are proportional to the display size and pixel ratio.
Fonts with `font-display: optional` are preloaded
It is recommended that optional fonts are preloaded.

Audits

Page has the HTML doctype
Ensure a doctype is specified to prevent the browser from switching to quirks-mode.
Properly defines charset
It is advised to declare a character encoding, optionally via a <meta> tag in the first 1024 bytes of the HTML or in the Content-Type HTTP response header.

Audits

Avoids Application Cache
Application cache is deprecated and is no longer recommended.
Detected JavaScript libraries
Below is a list of all front-end JavaScript libraries that were detected on the page.
Name Version
Bootstrap
4.0.0-alpha.6
jQuery
3.2.1
jQuery UI
1.12.1
React
Handlebars
4.7.3
core-js
2.6.11: global, 2.6.9: global, 2.6.9: pure, 3.0.0: pure
Avoids deprecated APIs
Avoid deprecated APIs which will eventually be removed the browser.

Audits

Does not use HTTPS — 1 insecure request found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL
http://contactlenses.co.uk/
Links to cross-origin destinations are unsafe
Improve performance and prevent security vulnerabilities by adding rel="noopener" and rel="noreferrer" to external links.
Includes front-end JavaScript libraries with known security vulnerabilities — 4 vulnerabilities detected
Ensure that the use of third-party scripts is minimal and that only trusted third-party scripts are used as some may contain known security vulnerabilities which may be exploited by attackers.
Library Version Vulnerability Count Highest Severity
SHOW DETAILS
1
Medium
SHOW DETAILS
3
Medium

Audits

Registers an `unload` listener
The 'unload' event does not fire reliably, causing issues with browser optimizations such as the Back-Forward Cache. It is recommended that 'pagehide' or 'visibilitychange' events are used instead.
URL
SHOW DETAILS
SHOW DETAILS
Browser errors were logged to the console
Below is a list of all errors logged to the console, which indicate unresolved problems on the site.
URL Description
https://www.facebook.com/tr/
Failed to load resource: net::ERR_BLOCKED_BY_CLIENT.Inspector
Missing source maps for large first-party JavaScript
Consider deploying source maps for added benefits such as the ability to debug while in production.
URL Map URL
https://assets.flex.twilio.com/releases/flex-webchat-ui/2.4.0/twilio-flex-webchat.min.js
https://assets.flex.twilio.com/releases/flex-webchat-ui/2.4.0/twilio-flex-webchat.prod.browser.js.map
https://widget.trustpilot.com/trustboxes/54ad5defc6454f065c28af8b/main.js
https://widget.trustpilot.com/trustboxes/54ad5defc6454f065c28af8b/main.js.map
https://widget.trustpilot.com/bootstrap/v5/tp.widget.bootstrap.min.js
https://widget.trustpilot.com/bootstrap/v5/tp.widget.bootstrap.min.js.map
83

SEO

Indicates how well the page is optimized for ranking in search engines and highlights Search Engine Optimization (SEO) opportunities for contactlenses.co.uk. This includes optimizations such as providing meta data.

Mobile Friendly

Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of contactlenses.co.uk on mobile screens.
Document uses legible font sizes
Font sizes of 12px or less are too small to most mobile users without user gestures and further action. Aim for more than 60% of page text to use font sizes greater than 12px.
Tap targets are sized appropriately
Interactive elements (such as buttons and links) should be appropriately spaced, sized and easy enough to select or tap with regard to their surrounding elements.

Content Best Practices

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
Document has a meta description
Meta descriptions may be used by search engines when displaying a link to the page and should concisely summarize the page's content.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
Document has a valid `hreflang`
Search engines can be instructed to list specific versions of a page for a given language or region through the use of hreflang links.
Document has a valid `rel=canonical`
Search engines can be suggested which URL should be shown in search results through the use of canonical links.
Document avoids plugins
The content of plugins cannot be indexed by search engines and many devices either restrict or do not support them.

Crawling and Indexing

Page has successful HTTP status code
Avoid pages with unsuccessful HTTP status codes as they may not be indexed by search engines.
Page isn’t blocked from indexing
Pages that cannot be crawled by search engines cannot be indexed or included in their search results. Ensure that search engines have permission to crawl all pages that should be indexed.
robots.txt is valid
Malformed robots.txt files prevent crawlers from understanding how a site wants to be crawled or indexed, which can be devastating to SEO.

Content Best Practices

Links do not have descriptive text — 2 links found
Make use of descriptive link text to assist search engines in understanding the content.

Crawling and Indexing

Links are not crawlable
Ensure that the 'href' attribute of anchor elements links to the appropriate destination. This allows for more pages of the site to be discovered by search engines.

Manual Checks

Structured data is valid
Structured data can be validated through the use of the Structured Data Testing Tool and the Structured Data Linter.
19

Progressive Web App

Indicates how valid the aspects of a Progressive Web App (PWA) are for the page and highlights opportunities to enable/improve the PWA of contactlenses.co.uk. This includes details about web app manifests.

PWA Optimized

Redirects HTTP traffic to HTTPS
It is advised to redirect all HTTP traffic to HTTPS, in order to enable secure web features for all users.
Content is sized correctly for the viewport
Ensure that the width of the app's content matches the width of the viewport, otherwise the app might not be optimized for mobile screens.
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of contactlenses.co.uk on mobile screens.
Contains some content when JavaScript is not available
Apps should display alternative content for when JavaScript is disabled.

Fast and reliable

Page load is not fast enough on mobile networks — Interactive on simulated mobile network at 13.4 s
Ensure that the page loads fast enough over a cellular network, to ensure good mobile user experience.
Current page does not respond with a 200 when offline
In order for Progressive Web Apps to be made available offline, ensure that the app is using a service worker.
`start_url` does not respond with a 200 when offline
Consider using a service worker for Progressive Web Apps to ensure greater reliability for the user, in the case of poor network conditions.

Installable

Does not use HTTPS — 1 insecure request found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL
http://contactlenses.co.uk/
Does not register a service worker that controls page and `start_url`
A service worker is used to provide Progressive Web Apps the use of features such as working offline, the ability for the app to be added to the homescreen as well as push notifications.
Web app manifest does not meet the installability requirements
User engagement may be increased by leveraging the browsers ability to proactively prompt users to add the app to their homescreen.
View Data

PWA Optimized

Is not configured for a custom splash screen
Themed splash screens ensure a high-quality user experience at launch for app users.
View Data
Does not set a theme color for the address bar.
A theme may be applied to the browser address bar, which ideally can be made to match the site.
View Data
Does not provide a valid `apple-touch-icon`
iOS users of Progressive Web Apps will benefit from an apple touch icon, which can be defined with 'apple-touch-icon', which must point to a non-transparent 192px (or 180px) square PNG.
Manifest doesn't have a maskable icon
Maskable icons are great to ensure that images fill the entire shape when installing the app on a device.

Manual Checks

Site works cross-browser
Ensure that the Progressive Web App works correctly across every major browser.
Page transitions don't feel like they block on the network
Users perceive apps with responsive, snappy transitions as higher peforming and ensures a great user experience, even on a slow network.
Each page has a URL
Ensure that all pages are deep linkable via URL. They should also be unique for the purpose of shareability on social media.
Avg. (All Categories) 55
Performance 30
Accessibility 88
Best Practices 57
SEO 82
Progressive Web App 18
0–49 (Fail) 50–89 (Average) 90–100 (Pass)
URL: https://www.contactlenses.co.uk/
Updated: 21st November, 2020

1.74 seconds
First Contentful Paint (FCP)
30%
64%
6%

0.25 seconds
First Input Delay (FID)
15%
82%
3%

Simulate loading on mobile
30

Performance

Indicates how well the page is performing and highlights opportunities where performance may be improved for contactlenses.co.uk. This includes details about optimizing page load times which can result in a better user experience.

Metrics

Cumulative Layout Shift — 0.043
Cumulative Layout Shift is the measurement of visible elements collective movement within the viewport.
View Data

Opportunities

Properly size images
Images can slow down the page's load time. Contactlenses.co.uk should consider serving more appropriate-sized images.
Minify CSS
Cascading Style Sheets (CSS) files can contribute to network payload sizes. Contactlenses.co.uk should consider minifying CSS files.
Minify JavaScript — Potential savings of 8 KiB
JavaScript (JS) files can contribute to network payload sizes and increase script parse times. Contactlenses.co.uk should consider minifying JS files.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://res2.contactlenses.co.uk/assets/c33966bf/yii.activeForm.js
7533
4518
https://res2.contactlenses.co.uk/assets/c33966bf/yii.js
6181
3876
Efficiently encode images — Potential savings of 19 KiB
Unoptimized images can consume more cellular data than what is necessary.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://res2.contactlenses.co.uk/data/images/large/190.jpg
52060
14070
https://res2.contactlenses.co.uk/images/brand/3.jpg
8572
5335
Enable text compression — Potential savings of 3 KiB
Text-based resources should be served with compression, such as gzip, deflate or brotli.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://certify-js.alexametrics.com/atrk.js
4264
2637
Preconnect to required origins
Resource hints, such as 'preconnect' or 'dns-prefetch', may assist in establishing early connections to important third-party origins.
Avoid multiple page redirects — Potential savings of 630 ms
Redirects can cause additional delays before the page can begin loading. Contactlenses.co.uk should avoid multiple or unnecessary page redirects.
URL Time Spent (Ms)
http://contactlenses.co.uk/
630
https://www.contactlenses.co.uk/
0
Remove duplicate modules in JavaScript bundles
Ensure that no duplicate JavaScript modules from bundles exist to reduce bytes consumed by network activity.
Avoid serving legacy JavaScript to modern browsers — Potential savings of 26 KiB
Polyfills and transforms enable legacy browsers to use new JavaScript features. For bundled JavaScript it is recommended to adopt a modern script deployment strategy using module/nomodule feature detection. This will reduce the amount of code shipped to modern browsers.
URL Potential Savings (Bytes)
https://connect.facebook.net/signals/config/689952134759816?v=2.9.29&r=stable
11985
https://www.clickcease.com/monitor/stat.js
10757
https://assets.flex.twilio.com/releases/flex-webchat-ui/2.4.0/twilio-flex-webchat.min.js
3543
https://widget.trustpilot.com/bootstrap/v5/tp.widget.bootstrap.min.js
77
https://widget.trustpilot.com/trustboxes/54ad5defc6454f065c28af8b/main.js
77
https://res2.contactlenses.co.uk/assets/5ffe6807/js/tether.min.js
58
https://connect.facebook.net/en_US/fbevents.js
45
https://res2.contactlenses.co.uk/assets/7eced2f2/js/bootstrap.min.js
44

Diagnostics

Avoids enormous network payloads — Total size was 2,071 KiB
Large network payloads can cost users money and are linked to long load times.
URL Transfer Size (Bytes)
https://assets.flex.twilio.com/releases/flex-webchat-ui/2.4.0/twilio-flex-webchat.min.js
536481
https://res2.contactlenses.co.uk/data/hotoffer/155.gif
521201
https://res2.contactlenses.co.uk/fonts/fontawesome-webfont.woff2?v=4.7.0
77794
https://connect.facebook.net/signals/config/689952134759816?v=2.9.29&r=stable
71556
https://res2.contactlenses.co.uk/assets/235a363c/jquery-ui.min.js
68438
https://res2.contactlenses.co.uk/data/images/large/190.jpg
52367
https://res2.contactlenses.co.uk/css/css-ALL.min.css
49227
https://widget.trustpilot.com/trustboxes/54ad5defc6454f065c28af8b/main.js
48689
https://res2.contactlenses.co.uk/images/banner/home-big-banner-2.jpg
48662
https://www.contactlenses.co.uk/data/education/educmspages/146.png
44236
Avoid chaining critical requests — 14 chains found
Below is a list of Critical Request Chains, which shows which resources are loaded with a high priority. Contactlenses.co.uk should consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.
User Timing marks and measures
Make use of the User Timing API to measure an app's real-world performance during key user experiences.
Keep request counts low and transfer sizes small — 77 requests • 2,071 KiB
It is advised to add a budgets.json file in order to set budgets for the quantity and size of page resources.
Resource Type Requests Transfer Size (Bytes)
Total
77
2120801
Script
24
980447
Image
40
976308
Font
2
87494
Stylesheet
2
50771
Document
2
18440
Other
7
7341
Media
0
0
Third-party
26
863692
Minimize third-party usage — Third-party code blocked the main thread for 190 ms
It is advised to either limit, remove or delay the loading of redundant third-party code which may be significantly impacting load performance.
Third-Party Transfer Size (Bytes) Main-Thread Blocking Time (Ms)
SHOW DETAILS
63280
85.972
SHOW DETAILS
96625
62.456
SHOW DETAILS
20084
43.96
SHOW DETAILS
78950
0
SHOW DETAILS
16075
0
SHOW DETAILS
11244
0
SHOW DETAILS
9430
0
SHOW DETAILS
5319
0
SHOW DETAILS
746
0
Largest Contentful Paint element — 1 element found
The element which was identified as the Largest Contentful Paint.
Element
div
Avoid large layout shifts — 5 elements found
Below is a list of all DOM elements that contribute to the CLS of the page.
Element CLS Contribution
Covid-19 - We are shipping as normal, however, there may be a delay with some c…
0.036025113738769
0345 319 3000 £ GBP
0.0055079719352663
a
0.00073956515061741
REORDER
0.00017955972854493
VIEW AND BUY
8.5968454940145E-5
Avoids `document.write()`
Avoid or limit the use of external scripts that are dynamically injected via 'document.write()' as users on slow connections will be delayed by tens of seconds.
Avoid long main-thread tasks — 16 long tasks found
Below is a list of the longest tasks on the main thread, which is useful when identifying the worst input delay contributors.
URL Start Time (Ms) Duration (Ms)
https://widget.trustpilot.com/bootstrap/v5/tp.widget.bootstrap.min.js
13740
1672
https://assets.flex.twilio.com/releases/flex-webchat-ui/2.4.0/twilio-flex-webchat.min.js
15412
302
https://www.contactlenses.co.uk/
1585
178
https://res2.contactlenses.co.uk/assets/235a363c/jquery-ui.min.js
8340
144
https://connect.facebook.net/signals/config/689952134759816?v=2.9.29&r=stable
6570
137
https://widget.trustpilot.com/trustboxes/54ad5defc6454f065c28af8b/main.js
5453
136
https://widget.trustpilot.com/trustboxes/54ad5defc6454f065c28af8b/main.js
5250
118
https://www.google-analytics.com/analytics.js
5970
107
https://res2.contactlenses.co.uk/assets/1d68f126/jquery.min.js
6330
106
https://www.contactlenses.co.uk/
4440
102
https://widget.trustpilot.com/trustboxes/54ad5defc6454f065c28af8b/main.js
5368
85
Unattributable
630
80
https://connect.facebook.net/en_US/fbevents.js
3540
68
https://www.googletagmanager.com/gtag/js?id=AW-592711747&l=dataLayer&cx=c
6120
63
https://res2.contactlenses.co.uk/css/css-ALL.min.css
4740
52
https://res2.contactlenses.co.uk/assets/1d68f126/jquery.min.js
8484
52
Avoid non-composited animations
It is recommended to avoid non-composited animations which are often janky and increase CLS.
Avoids large JavaScript libraries with smaller alternatives — 0 large libraries found
It is recommended to work with smaller JavaScript libraries to reduce your bundle size and avoid poor performance.

Budgets

Performance budget
It is advised to keep the quantity and size of all network requests under the targets set by the provided performance budget.
Timing budget
It is advised to set a timing budget to monitor the performance of your site.

Other

Network Requests
Below is a list of network requests that were made during page load.
URL Start Time (Ms) End Time (Ms) Transfer Size (Bytes) Resource Size (Bytes) Status Code MIME Type Resource Type
http://contactlenses.co.uk/
0
327.26200000616
344
0
301
text/html
https://www.contactlenses.co.uk/
327.86399999168
1004.300999979
14893
72569
200
text/html
Document
https://res2.contactlenses.co.uk/css/css-ALL.min.css
1026.2460000231
1680.7089999784
49227
296635
200
text/css
Stylesheet
https://www.googletagmanager.com/gtag/js?id=UA-227300-2
1026.4220000245
1052.2660000133
39475
98176
200
application/javascript
Script
https://res2.contactlenses.co.uk/limages/contact-lenses-co-uk-logo.gif
1710.3670000215
2130.2710000309
4738
4433
200
image/gif
Image
https://res2.contactlenses.co.uk/data/hotoffer/155.gif
1710.4929999914
2564.6389999893
521201
520893
200
image/gif
Image
https://res2.contactlenses.co.uk/data/hotoffer/100.jpg
1710.6350000249
2244.4310000283
23832
23525
200
image/jpeg
Image
https://res2.contactlenses.co.uk/images/icon-baggage.png
1710.8470000094
2132.3609999963
1549
1245
200
image/png
Image
https://res2.contactlenses.co.uk/images/icon-cash.png
1711.0690000118
2131.62499998
1549
1245
200
image/png
Image
https://res2.contactlenses.co.uk/images/icon-security.png
1711.2510000006
2134.0900000068
1856
1552
200
image/png
Image
https://res2.contactlenses.co.uk/data/hotoffer/156.jpg
1711.409999989
2133.4110000171
16956
16649
200
image/jpeg
Image
https://res2.contactlenses.co.uk/data/hotoffer/109.jpg
1711.5810000105
2136.433000036
13430
13123
200
image/jpeg
Image
https://res2.contactlenses.co.uk/data/hotoffer/103.jpg
1711.7560000042
2130.6949999998
10267
9961
200
image/jpeg
Image
https://res2.contactlenses.co.uk/data/hotoffer/158.jpg
1711.9630000088
2235.4889999842
28255
27948
200
image/jpeg
Image
https://res2.contactlenses.co.uk/data/hotoffer/116.jpg
1712.1749999933
2132.7990000136
10522
10215
200
image/jpeg
Image
https://res2.contactlenses.co.uk/images/trustpilot-logo.jpg
1712.342999992
2131.9810000132
8226
7920
200
image/jpeg
Image
https://res2.contactlenses.co.uk/images/brand/acuvue.png
1712.5060000108
2135.6329999981
6143
5838
200
image/png
Image
https://res2.contactlenses.co.uk/images/brand/1.jpg
1712.6770000323
2134.9310000078
6763
6457
200
image/jpeg
Image
https://res2.contactlenses.co.uk/images/brand/ciba.jpg
1712.9030000069
2134.309999994
4095
3790
200
image/jpeg
Image
https://res2.contactlenses.co.uk/images/brand/12.jpg
1713.1340000196
2133.8899999973
7016
6710
200
image/jpeg
Image
https://res2.contactlenses.co.uk/images/brand/25.jpg
1713.3279999834
2143.5300000012
5217
4911
200
image/jpeg
Image
https://res2.contactlenses.co.uk/images/brand/3.jpg
1713.5260000359
2150.7449999917
8878
8572
200
image/jpeg
Image
https://res2.contactlenses.co.uk/images/brand/5.jpg
1713.7050000019
2135.2630000329
2806
2501
200
image/jpeg
Image
https://res2.contactlenses.co.uk/images/banner/home-big-banner-2.jpg
1713.8730000006
2233.7769999867
48662
48355
200
image/jpeg
Image
https://www.contactlenses.co.uk/data/education/educmspages/146.png
1714.0650000074
2371.6129999957
44236
43883
200
image/png
Image
https://res2.contactlenses.co.uk/images/youtube.jpg
1714.1929999925
2133.1169999903
7730
7424
200
image/jpeg
Image
https://res2.contactlenses.co.uk/images/partner/partner-4.jpg
1714.3130000331
2135.9950000187
4224
3919
200
image/jpeg
Image
https://res2.contactlenses.co.uk/images/gd2.gif
1714.4120000303
2150.1970000099
10461
10155
200
image/gif
Image
https://res2.contactlenses.co.uk/images/logo-footer.png
1714.5129999844
2137.9210000159
5644
5339
200
image/png
Image
https://widget.trustpilot.com/bootstrap/v5/tp.widget.bootstrap.min.js
1062.5810000347
1085.802000016
7274
20553
200
application/x-javascript
Script
https://assets.flex.twilio.com/releases/flex-webchat-ui/2.4.0/twilio-flex-webchat.min.js
1087.4869999825
1269.5149999927
536481
2383865
200
application/javascript
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Image
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Font
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Stylesheet
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Script
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Other
Network Round Trip Times — 0 ms
High Network RTT (Round Trip Times) can have a large impact on performance. Providing servers geographically closer to the user could improve performance.
Server Backend Latencies — 0 ms
High server latencies indicate the server is overloaded or has a poor backend performance.
Tasks
Below is a list of the top-level main thread tasks that executed during page load.
Start Time (Ms) End Time (Ms)
1043.62
9.048
1058.821
6.264
1098.019
9.495
1718.188
12.896
1731.163
25.437
1756.616
88.883
1847.004
417.879
2264.912
7.952
2296.535
9.358
2316.634
24.404
2341.674
26.43
2369.514
7.653
2382.251
26.718
2409.028
17.064
2426.119
6.1
2432.283
5.772
2438.223
15.657
2464.545
8.958
2475.258
35.922
2511.233
21.397
2532.685
9.212
2541.931
7.148
2554.29
13.05
2567.355
6.876
2578.9
5.149
2584.329
20.121
2605.69
34.368
2649.057
6.845
2686.318
29.55
2715.887
17.941
2738.101
21.352
3037.215
75.478
3112.719
12.997
3135.277
16.382
3151.679
6.661
3477.235
67.961
Diagnostics
Below is a collection of useful page vitals.
View Data
Metrics
Below is a collection of metrics.
View Data

Metrics

First Contentful Paint — 2.6 s
The time taken for the first image or text on the page to be rendered.
Speed Index — 5.1 s
The time taken for the page contents to be visibly populated.

Other

First Meaningful Paint — 2.6 s
The time taken for the primary content of the page to be rendered.
First Contentful Paint (3G) — 5190 ms
The time taken for the first image or text on the page to be rendered while on a 3G network.

Opportunities

Remove unused CSS — Potential savings of 45 KiB
Dead and/or unused rules in Style Sheets (CSS) can contribute to network payload sizes. Contactlenses.co.uk should consider removing dead rules from style sheets and deferring the loading of CSS not used for above-the-fold content.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://res2.contactlenses.co.uk/css/css-ALL.min.css
49227
45962
Serve images in next-gen formats — Potential savings of 66 KiB
Image formats like PNG and JPEG have poor compression when compared to other next-gen formats, such as JPEG 200, JPEG XR and WebP.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://res2.contactlenses.co.uk/data/images/large/190.jpg
52060
37526
https://www.contactlenses.co.uk/data/education/educmspages/146.png
43883
30151

Diagnostics

Avoid an excessive DOM size — 1,039 elements
A large DOM (Document Object Model) will increase memory usage, cause longer system calculations as well as costly layout reflows.
Statistic Element Value
Total DOM Elements
1,039
Maximum DOM Depth
SHOW DETAILS
17
Maximum Child Elements
SHOW DETAILS
28
Reduce JavaScript execution time — 2.9 s
JavaScript (JS) execution time can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
URL Total CPU Time (Ms) Script Evaluation (Ms) Script Parse (Ms)
https://assets.flex.twilio.com/releases/flex-webchat-ui/2.4.0/twilio-flex-webchat.min.js
1766.044
1608.876
155.124
https://www.contactlenses.co.uk/
1114.016
133.904
10.74
https://widget.trustpilot.com/trustboxes/54ad5defc6454f065c28af8b/main.js
516.524
267.428
16.152
Unattributable
512.156
12.156
0.84
https://res2.contactlenses.co.uk/assets/1d68f126/jquery.min.js
191.936
177.028
5.992
https://connect.facebook.net/signals/config/689952134759816?v=2.9.29&r=stable
164.116
135.364
19.084
https://www.google-analytics.com/analytics.js
119.044
101.436
6.856
https://widget.trustpilot.com/trustboxes/54ad5defc6454f065c28af8b/index.html?templateId=54ad5defc6454f065c28af8b&businessunitId=471772d8000064000501ef03
89.636
6.72
4.132
https://res2.contactlenses.co.uk/assets/235a363c/jquery-ui.min.js
88.528
63.16
17.36
https://www.googletagmanager.com/gtag/js?id=AW-592711747&l=dataLayer&cx=c
83.972
71.932
9.396
https://connect.facebook.net/en_US/fbevents.js
68.256
56.144
8.584
https://widget.trustpilot.com/bootstrap/v5/tp.widget.bootstrap.min.js
57.456
44.64
5.788
https://res2.contactlenses.co.uk/css/css-ALL.min.css
51.584
0
0

Metrics

Largest Contentful Paint — 10.1 s
The timing of the largest text or image that is painted.
Time to Interactive — 13.7 s
The time taken for the page to become fully interactive.
Total Blocking Time — 1,510 ms
The total blocking time is the sum of all time periods between First Contentful Paint and Time to Interactive (when task length exceeded 50ms).

Other

First CPU Idle — 11.7 s
The time taken for the page's main thread to be quiet enough to handle input.
Max Potential First Input Delay — 1,670 ms
Users could experience a delay when interacting with the page.
Estimated Input Latency — 950 ms
The time taken for the page to respond to user input (during the busiest 5 second window of page load). Users are likely to perceive contactlenses.co.uk as laggy when the latency is higher than 0.05 seconds.

Opportunities

Eliminate render-blocking resources — Potential savings of 880 ms
Resources, such as JavaScript and style sheets, can block the first paint of the page. Contactlenses.co.uk should consider delivering critical JavaScript/style sheets (JS/CSS) inline and deferring all non-critical JS/CSS.
URL Transfer Size (Bytes) Potential Savings (Ms)
https://res2.contactlenses.co.uk/css/css-ALL.min.css
49227
1080
Defer offscreen images — Potential savings of 770 KiB
Time to Interactive can be slowed down by resources on the page. Contactlenses.co.uk should consider lazy-loading offscreen and hidden images.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://res2.contactlenses.co.uk/data/hotoffer/155.gif
520893
520893
https://res2.contactlenses.co.uk/images/banner/home-big-banner-2.jpg
48355
48355
https://www.contactlenses.co.uk/data/education/educmspages/146.png
43883
43883
https://res2.contactlenses.co.uk/data/hotoffer/158.jpg
27948
27948
https://res2.contactlenses.co.uk/data/hotoffer/100.jpg
23525
23525
https://res2.contactlenses.co.uk/data/hotoffer/156.jpg
16649
16649
https://res2.contactlenses.co.uk/data/hotoffer/109.jpg
13123
13123
https://res2.contactlenses.co.uk/data/hotoffer/116.jpg
10215
10215
https://res2.contactlenses.co.uk/images/gd2.gif
10155
10155
https://res2.contactlenses.co.uk/data/hotoffer/103.jpg
9961
9961
https://res2.contactlenses.co.uk/images/brand/3.jpg
8572
8572
https://res2.contactlenses.co.uk/images/trustpilot-logo.jpg
7920
7920
https://res2.contactlenses.co.uk/images/youtube.jpg
7424
7424
https://res2.contactlenses.co.uk/images/brand/12.jpg
6710
6710
https://res2.contactlenses.co.uk/images/brand/1.jpg
6457
6457
https://res2.contactlenses.co.uk/images/brand/acuvue.png
5838
5838
https://res2.contactlenses.co.uk/images/logo-footer.png
5339
5339
https://res2.contactlenses.co.uk/images/brand/25.jpg
4911
4911
https://res2.contactlenses.co.uk/images/partner/partner-4.jpg
3919
3919
https://res2.contactlenses.co.uk/images/brand/ciba.jpg
3790
3790
https://res2.contactlenses.co.uk/images/brand/5.jpg
2501
2501
Remove unused JavaScript — Potential savings of 429 KiB
It is advised to remove unused JavaScript in order to reduce bytes consumed by network activity.
URL Transfer Size (Bytes) Potential Savings (Bytes)
https://assets.flex.twilio.com/releases/flex-webchat-ui/2.4.0/twilio-flex-webchat.min.js
536481
282153
https://res2.contactlenses.co.uk/assets/235a363c/jquery-ui.min.js
68438
59558
https://connect.facebook.net/signals/config/689952134759816?v=2.9.29&r=stable
71556
54106
https://www.googletagmanager.com/gtag/js?id=AW-592711747&l=dataLayer&cx=c
39475
22161
https://www.googletagmanager.com/gtag/js?id=UA-227300-2
39475
21490
Reduce initial server response time — Root document took 680 ms
It is advised to keep the server response time short for the main document, because all other requests depend on it.
URL Time Spent (Ms)
https://www.contactlenses.co.uk/
677.434
Preload key requests — Potential savings of 2,880 ms
Key requests can be preloaded by using '<link rel=preload>'. Contactlenses.co.uk should consider using '<link rel=preload>' to prioritize fetching resources that are currently requested later in page load.
URL Potential Savings (Ms)
https://res2.contactlenses.co.uk/fonts/fontawesome-webfont.woff2?v=4.7.0
2880
Use video formats for animated content — Potential savings of 336 KiB
Large GIFs are inefficient for delivering animated content. It is recommended to use MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF.
URL Resource Size (Bytes) Potential Savings (Bytes)
https://res2.contactlenses.co.uk/data/hotoffer/155.gif
520893
343789

Diagnostics

Serve static assets with an efficient cache policy — 57 resources found
Contactlenses.co.uk can speed up repeat visits by increasing the cache lifetime, which is essentially how long before a cached copy expires.
URL Cache TTL (Ms) Transfer Size (Bytes)
https://assets.flex.twilio.com/releases/flex-webchat-ui/2.4.0/twilio-flex-webchat.min.js
0
536481
https://certify.alexametrics.com/atrk.gif?frame_height=667&frame_width=376&iframe=0&title=Contact%20Lenses%20UK%20%7C%20Cheap%20and%20comfortable%20contact%20lenses%20%7C%20Contactlenses.co.uk&time=1606000403349&time_zone_offset=480&screen_params=360x640x24&java_enabled=0&cookie_enabled=1&ref_url=&host_url=https%3A%2F%2Fwww.contactlenses.co.uk%2F&random_number=13574281983&sess_cookie=aeb35821175ed1563944bd63f67&sess_cookie_flag=1&user_cookie=aeb35821175ed1563944bd63f67&user_cookie_flag=1&dynamic=true&domain=contactlenses.co.uk&account=Cyhlv1DlQy20Y8&jsv=20130128&user_lang=en-US
0
552
https://connect.facebook.net/signals/config/689952134759816?v=2.9.29&r=stable
1200000
71556
https://connect.facebook.net/en_US/fbevents.js
1200000
24606
https://www.google-analytics.com/analytics.js
7200000
19452
https://widget.trustpilot.com/trustboxes/54ad5defc6454f065c28af8b/main.js
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Minimize main-thread work — 5.1 s
Main-thread work timing can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
Category Time Spent (Ms)
Script Evaluation
2835.952
Style & Layout
723.612
Other
597.624
Parse HTML & CSS
333.388
Script Parsing & Compilation
310.636
Rendering
179.556
Garbage Collection
80.468
Ensure text remains visible during webfont load
Make use of the font-display CSS feature, which will ensure text is user-visible while webfonts are loading.
URL Potential Savings (Ms)
https://res2.contactlenses.co.uk/fonts/fontawesome-webfont.woff2?v=4.7.0
620.2930000145
https://fonts.gstatic.com/s/opensans/v18/mem8YaGs126MiZpBA-UFVZ0bf8pkAg.woff2
2.6400000206195
Does not use passive listeners to improve scrolling performance
Improve the page's scroll performance by marking touch and wheel event listeners as 'passive'.
URL Location
https://widget.trustpilot.com/trustboxes/54ad5defc6454f065c28af8b/main.js
line: 0
88

Accessibility

Indicates how accessible the page is and highlights opportunities where the page can be made more accessible to users of contactlenses.co.uk. This includes details about various page attributes that can be optimized.

Navigation

`[accesskey]` values are unique
Access keys assist users with focusing on different parts of the page. Each access key should be unique for proper navigation.
The page contains a heading, skip link, or landmark region
It is advised to provide ways to bypass repetitive content, allowing users to navigate the page efficiently.
`[id]` attributes on active, focusable elements are unique
Ensure all focusable elements have a unique id value to allow them to be visible to users of assistive technologies, like a screen reader.
No element has a `[tabindex]` value greater than 0
Although technically valid, a tabindex value greater than 0 often creates frustrating experiences for users who rely on assistive technologies.

ARIA

`[aria-*]` attributes match their roles
Avoid mismatching 'aria-*' attributes and their 'role' value, as it invalidates the attribute.
`[aria-hidden="true"]` is not present on the document `<body>`
If aria-hidden=true is set on the document body, assistive technologies, like a screen reader will work inconsistently.
`[aria-hidden="true"]` elements do not contain focusable descendents
Interactive elements within an aria-hidden=true element are unavailable to users of assistive technologies, like a screen reader.
ARIA input fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when an input field does not have an accessible name specified.
`[role]`s have all required `[aria-*]` attributes
Some ARIA roles have required 'aria-*' attributes, which provide essential information about state and functionality.
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Some ARIA parent roles cannot perform their intended functions if specific child roles are not used.
`[role]`s are contained by their required parent element
Some ARIA child roles cannot perform their intended functions if specific parent roles are not used.
`[role]` values are valid
All ARIA roles require valid values to perform their intended functions.
ARIA toggle fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when a toggle field does not have an accessible name specified.
`[aria-*]` attributes have valid values
ARIA attributes cannot be interpreted with invalid values when used by screen readers and other assistive technologies.
`[aria-*]` attributes are valid and not misspelled
ARIA attributes cannot be interpreted with invalid names when used by screen readers and other assistive technologies.
ARIA IDs are unique
Ensure all ARIA ID values are unique to prevent elements from being overlooked by assistive technologies, like a screen reader.

Tables and lists

`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Screen readers and other assistive technologies may produce poor and inaccurate output when definition lists are not properly marked up.
Definition list items are wrapped in `<dl>` elements
In order for screen readers and other assistive technologies to properly announce definition list items ('<dt>' and '<dd>'), they must be wrapped in parent a '<dl>' element.
Presentational `<table>` elements avoid using `<th>`, `<caption>` or the `[summary]` attribute.
It is advised to not include data elements in tables which are used for layout purposes, as it may create confusion for screen reader and other assistive technology users.
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Use proper list structure to aid screen readers and other assistive technologies.
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
In order for screen readers to announce list items, ensure that list items ('<li>') are contained within parent '<ul>' or '<ol>' tags.
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that '<td>' cells using the headers attribute only refer to other cells in the same table, to improve screen reader user experience.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that table headers refer to some set of cells, to improve screen reader user experience.

Names and labels

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
No form fields have multiple labels
Having multiple labels for form fields can be confusing to assistive technologies, like a screen reader.
`<frame>` or `<iframe>` elements have a title
Screen reader users and other assistive technology users rely on frame titles to describe the contents of frames.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
`<input type="image">` elements have `[alt]` text
Input buttons with alternative text assist screen readers and other assistive technology users to understand its purpose.
Form elements have associated labels
Screen readers and other assistive technologies rely on labels to properly announce form controls.
`<object>` elements have `[alt]` text
It is advised that alt text is used on '<object>' elements in order to provide meaning to screen reader and other assistive technology users, as these technologies are unable to translate non-text content.

Internationalization and localization

`<html>` element has a `[lang]` attribute
It is advised to provide a lang attribute so that screen readers and other assistive technologies are guaranteed to announce the page's text correctly. When not provided, the user's default language setting will be used which may cause inaccuracies.
`<html>` element has a valid value for its `[lang]` attribute
Specify a valid BCP 47 language in order to help screen readers and other assistive technologies announce text properly.
`[lang]` attributes have a valid value
Specify a valid BCP 47 language on elements in order to help screen readers and other assistive technologies announce text properly.

Best practices

The document does not use `<meta http-equiv="refresh">`
Pages that refresh automatically cause a poor user experience as focus is directed back to the top of the page unexpectedly.
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
For users with low vision who rely on screen magnification, ensure that zooming is not disabled.

Audio and video

`<video>` elements contain a `<track>` element with `[kind="captions"]`
Contactlenses.co.uk may provide assistance to deaf or hearing-impaired users with captions on videos.
`<video>` elements contain a `<track>` element with `[kind="description"]`
Contactlenses.co.uk may provide relevant information that dialogue cannot, by using audio descriptions.

Names and labels

Buttons do not have an accessible name
Buttons become unusable as they are announced simply as "button" when the button does not have an accessible name, when used by screen readers and other assistive technologies.
Failing Elements
a
a
Links do not have a discernible name
In order to improve the navigation for screen reader and other assistive technology users, use link text that is unique, focusable and discernible.

Contrast

Background and foreground colors do not have a sufficient contrast ratio.
Many (if not most) users find low-contrast text difficult or impossible to read.
Failing Elements
0345 319 3000
REORDER
Covid-19 - We are shipping as normal, however, there may be a delay with some c…
click here
.99
.50
.00
.75
.99
.75
.99
.50
Free shipping on UK orders over £30
When you refer your friends
About Us
Delivery Information
Returns and Refunds Policy
Sitemap
Help
Contact us
Affiliate Program
Eyecare
Chat with us

Navigation

Heading elements are not in a sequentially-descending order
Properly order all headers and do not skip heading levels to better the navigation and readability for users of assistive technologies, like a screen reader.
Failing Elements
About Us

Manual Checks

The page has a logical tab order
The visual layout should be logical in its tab order and users cannot focus elements that are offscreen.
Interactive controls are keyboard focusable
Ensure that custom interactive controls are keyboard focusable and that a focus indicator is displayed.
Interactive elements indicate their purpose and state
Ensure that interactive elements (such as links and buttons) are distinguishable from non-interactive elements and that they indicate their state.
The user's focus is directed to new content added to the page
When new content (such as a dialogue) is added to the page, the user's focus should be directed to it.
User focus is not accidentally trapped in a region
Avoid focus being accidentally trapped when a user tabs in and out of controls or regions on page.
Custom controls have associated labels
Ensure that custom interactive controls have associated labels, which are provided by aria-label and aria-labelledby attributes.
Custom controls have ARIA roles
Ensure that all custom interactive controls have appropriate ARIA roles.
Visual order on the page follows DOM order
Ensure that the DOM order matches with the page's visual order, in order to improve navigation for screen readers and other assistive technologies.
Offscreen content is hidden from assistive technology
Ensure that offscreen content is hidden through the use of "display:none" styling or the aria-hidden attribute.
HTML5 landmark elements are used to improve navigation
Elements such as <main> and <nav> are recommended as they are used by screen readers and other assistive technologies to improve keyboard navigation.
57

Best Practices

Indicates the recommended, best practices currently in place on the page and highlights the best practices that contactlenses.co.uk should incorporate. This includes practices such as protecting pages with HTTPS.

Audits

Avoids requesting the geolocation permission on page load
When requesting a user's location, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids requesting the notification permission on page load
When requesting permission to send notifications, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.

Audits

Allows users to paste into password fields
Ensure that password inputs may be pasted into to aid in the user's ability to use password managers and improve security.
Displays images with correct aspect ratio
Ensure that image display dimensions match their natural aspect ratio.
Fonts with `font-display: optional` are preloaded
It is recommended that optional fonts are preloaded.

Audits

Page has the HTML doctype
Ensure a doctype is specified to prevent the browser from switching to quirks-mode.
Properly defines charset
It is advised to declare a character encoding, optionally via a <meta> tag in the first 1024 bytes of the HTML or in the Content-Type HTTP response header.

Audits

Avoids Application Cache
Application cache is deprecated and is no longer recommended.
Detected JavaScript libraries
Below is a list of all front-end JavaScript libraries that were detected on the page.
Name Version
Bootstrap
4.0.0-alpha.6
jQuery
3.2.1
jQuery UI
1.12.1
React
Handlebars
4.7.3
core-js
2.6.11: global, 2.6.9: global, 2.6.9: pure, 3.0.0: pure
Avoids deprecated APIs
Avoid deprecated APIs which will eventually be removed the browser.

Audits

Does not use HTTPS — 1 insecure request found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL
http://contactlenses.co.uk/
Links to cross-origin destinations are unsafe
Improve performance and prevent security vulnerabilities by adding rel="noopener" and rel="noreferrer" to external links.
Includes front-end JavaScript libraries with known security vulnerabilities — 4 vulnerabilities detected
Ensure that the use of third-party scripts is minimal and that only trusted third-party scripts are used as some may contain known security vulnerabilities which may be exploited by attackers.
Library Version Vulnerability Count Highest Severity
SHOW DETAILS
1
Medium
SHOW DETAILS
3
Medium

Audits

Serves images with low resolution
For maximum image clarity, ensure images have natural dimensions and are proportional to the display size and pixel ratio.
URL Displayed size Actual size Expected size
https://res2.contactlenses.co.uk/limages/contact-lenses-co-uk-logo.gif
275 x 53
275 x 53
722 x 140

Audits

Registers an `unload` listener
The 'unload' event does not fire reliably, causing issues with browser optimizations such as the Back-Forward Cache. It is recommended that 'pagehide' or 'visibilitychange' events are used instead.
URL
SHOW DETAILS
SHOW DETAILS
Browser errors were logged to the console
Below is a list of all errors logged to the console, which indicate unresolved problems on the site.
URL Description
https://www.facebook.com/tr/
Failed to load resource: net::ERR_BLOCKED_BY_CLIENT.Inspector
Missing source maps for large first-party JavaScript
Consider deploying source maps for added benefits such as the ability to debug while in production.
URL Map URL
https://assets.flex.twilio.com/releases/flex-webchat-ui/2.4.0/twilio-flex-webchat.min.js
https://assets.flex.twilio.com/releases/flex-webchat-ui/2.4.0/twilio-flex-webchat.prod.browser.js.map
https://widget.trustpilot.com/trustboxes/54ad5defc6454f065c28af8b/main.js
https://widget.trustpilot.com/trustboxes/54ad5defc6454f065c28af8b/main.js.map
https://widget.trustpilot.com/bootstrap/v5/tp.widget.bootstrap.min.js
https://widget.trustpilot.com/bootstrap/v5/tp.widget.bootstrap.min.js.map
82

SEO

Indicates how well the page is optimized for ranking in search engines and highlights Search Engine Optimization (SEO) opportunities for contactlenses.co.uk. This includes optimizations such as providing meta data.

Mobile Friendly

Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of contactlenses.co.uk on mobile screens.
Document uses legible font sizes — 97% legible text
Font sizes of 12px or less are too small to most mobile users without user gestures and further action. Aim for more than 60% of page text to use font sizes greater than 12px.
Source Selector % of Page Text Font Size
SHOW DETAILS
.product .product-header .subtitle
1.21%
11px
SHOW DETAILS
.benefits-group-area .benefits .content p
0.88%
11px
SHOW DETAILS
.rating-smallest
0.69%
11px
SHOW DETAILS
.product .product-footer .price span
0.22%
11px
SHOW DETAILS
97.00%
≥ 12px

Content Best Practices

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
Document has a meta description
Meta descriptions may be used by search engines when displaying a link to the page and should concisely summarize the page's content.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
Document has a valid `hreflang`
Search engines can be instructed to list specific versions of a page for a given language or region through the use of hreflang links.
Document has a valid `rel=canonical`
Search engines can be suggested which URL should be shown in search results through the use of canonical links.
Document avoids plugins
The content of plugins cannot be indexed by search engines and many devices either restrict or do not support them.

Crawling and Indexing

Page has successful HTTP status code
Avoid pages with unsuccessful HTTP status codes as they may not be indexed by search engines.
Page isn’t blocked from indexing
Pages that cannot be crawled by search engines cannot be indexed or included in their search results. Ensure that search engines have permission to crawl all pages that should be indexed.
robots.txt is valid
Malformed robots.txt files prevent crawlers from understanding how a site wants to be crawled or indexed, which can be devastating to SEO.

Content Best Practices

Links do not have descriptive text — 2 links found
Make use of descriptive link text to assist search engines in understanding the content.

Crawling and Indexing

Links are not crawlable
Ensure that the 'href' attribute of anchor elements links to the appropriate destination. This allows for more pages of the site to be discovered by search engines.

Mobile Friendly

Tap targets are not sized appropriately — 55% appropriately sized tap targets
Interactive elements (such as buttons and links) should be appropriately spaced, sized and easy enough to select or tap with regard to their surrounding elements.
Tap Target Size Overlapping Target
9 reviews
40x12
VIEW AND BUY
a
32x22
a
a
32x22
a
a
32x22
a
a
32x22
a
a
32x22
a
a
32x22
a
a
32x22
a
a
32x22
a
476 reviews
40x12
VIEW AND BUY
263 reviews
40x12
VIEW AND BUY
190 reviews
40x12
VIEW AND BUY
49 reviews
40x12
VIEW AND BUY
454 reviews
40x12
VIEW AND BUY
87 reviews
40x12
VIEW AND BUY
426 reviews
40x12
VIEW AND BUY
India
36x15
Canada
USA
34x15
Spain
Spain
41x15
Taiwan
Delivery Information
115x15
Returns and Refunds Policy
Contact us
62x15
Returns and Refunds Policy
Affiliate Program
95x15
Returns and Refunds Policy
About Us
53x15
Returns and Refunds Policy
Sitemap
47x15
Eyecare
Italy
31x15
Portugal
Japan
43x15
Australia
Poland
48x15
Germany
France
48x15
Portugal
Italy
31x15
Poland
Ireland
47x15
Germany
a
24x24
a
a
24x24
a
a
24x24
a
a
24x24
a
Ireland
47x15
Australia

Manual Checks

Structured data is valid
Structured data can be validated through the use of the Structured Data Testing Tool and the Structured Data Linter.
18

Progressive Web App

Indicates how valid the aspects of a Progressive Web App (PWA) are for the page and highlights opportunities to enable/improve the PWA of contactlenses.co.uk. This includes details about web app manifests.

PWA Optimized

Redirects HTTP traffic to HTTPS
It is advised to redirect all HTTP traffic to HTTPS, in order to enable secure web features for all users.
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of contactlenses.co.uk on mobile screens.
Contains some content when JavaScript is not available
Apps should display alternative content for when JavaScript is disabled.

Fast and reliable

Page load is not fast enough on mobile networks — Interactive at 13.7 s
Ensure that the page loads fast enough over a cellular network, to ensure good mobile user experience.
Current page does not respond with a 200 when offline
In order for Progressive Web Apps to be made available offline, ensure that the app is using a service worker.
`start_url` does not respond with a 200 when offline
Consider using a service worker for Progressive Web Apps to ensure greater reliability for the user, in the case of poor network conditions.

Installable

Does not use HTTPS — 1 insecure request found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL
http://contactlenses.co.uk/
Does not register a service worker that controls page and `start_url`
A service worker is used to provide Progressive Web Apps the use of features such as working offline, the ability for the app to be added to the homescreen as well as push notifications.
Web app manifest does not meet the installability requirements
User engagement may be increased by leveraging the browsers ability to proactively prompt users to add the app to their homescreen.
View Data

PWA Optimized

Is not configured for a custom splash screen
Themed splash screens ensure a high-quality user experience at launch for app users.
View Data
Does not set a theme color for the address bar.
A theme may be applied to the browser address bar, which ideally can be made to match the site.
View Data
Content is not sized correctly for the viewport
Ensure that the width of the app's content matches the width of the viewport, otherwise the app might not be optimized for mobile screens.
Does not provide a valid `apple-touch-icon`
iOS users of Progressive Web Apps will benefit from an apple touch icon, which can be defined with 'apple-touch-icon', which must point to a non-transparent 192px (or 180px) square PNG.
Manifest doesn't have a maskable icon
Maskable icons are great to ensure that images fill the entire shape when installing the app on a device.

Manual Checks

Site works cross-browser
Ensure that the Progressive Web App works correctly across every major browser.
Page transitions don't feel like they block on the network
Users perceive apps with responsive, snappy transitions as higher peforming and ensures a great user experience, even on a slow network.
Each page has a URL
Ensure that all pages are deep linkable via URL. They should also be unique for the purpose of shareability on social media.
Hosting

Server Location

Server IP Address: 148.251.175.35
Continent:
Country:
Region:
City:
Longitude:
Latitude:
Currencies:
Languages:

Web Hosting Provider

Registration

Domain Registrant

Private Registration: No
Name:
Organization:
Country:
City:
State:
Post Code:
Email:
Phone:
Note: Registration information is derived from various sources and may be inaccurate.

Domain Registrar

Security

Visitor Safety

Mature Content: Not Likely
McAfee WebAdvisor Rating: Safe
WOT Rating: 4.2/5 (0 reviews)
WOT Trustworthiness: 84/100
WOT Child Safety: 89/100
Note: Safety information is not guaranteed.

SSL/TLS Certificate

Issued To: *.contactlenses.co.uk
Issued By: Go Daddy Secure Certificate Authority - G2
Valid From: 27th October, 2020
Valid To: 21st November, 2021
Subject: CN = *.contactlenses.co.uk
Hash: 4f7d247e
Issuer: CN = Go Daddy Secure Certificate Authority - G2
OU = http://certs.godaddy.com/repository/
O = GoDaddy.com, Inc.
S = US
Version: 2
Serial Number: 9896047668350619819
Serial Number (Hex): 8955D2EC405F10AB
Valid From: 27th October, 2024
Valid To: 21st November, 2024
Signature Algorithm (Short Name): RSA-SHA256
Signature Algorithm (Long Name): sha256WithRSAEncryption
Authority Key Identifier: keyid:40:C2:BD:27:8E:CC:34:83:30:A2:33:D7:FB:6C:B3:F0:B4:2C:80:CE
Extended Key Usage: TLS Web Server Authentication, TLS Web Client Authentication
CRL Distribution Points:
Full Name:
URI:http://crl.godaddy.com/gdig2s1-2412.crl
Certificate Policies: Policy: 2.16.840.1.114413.1.7.23.1
CPS: http://certificates.godaddy.com/repository/
Policy: 2.23.140.1.2.1
Authority Information Access: OCSP - URI:http://ocsp.godaddy.com/
CA Issuers - URI:http://certificates.godaddy.com/repository/gdig2.crt
SCT List: Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : F6:5C:94:2F:D1:77:30:22:14:54:18:08:30:94:56:8E:
E3:4D:13:19:33:BF:DF:0C:2F:20:0B:CC:4E:F1:64:E3
Timestamp : Oct 27 19:12:58.552 2020 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:45:02:20:7D:DB:70:DF:87:8A:E2:FC:EB:63:B1:C0:
36:87:27:93:DD:DA:8B:B9:39:64:72:B2:91:81:E7:65:
45:2C:F3:5B:02:21:00:E6:6F:03:D0:AE:BB:0C:73:B9:
02:5C:04:0A:3B:5F:FC:5C:92:BC:0F:26:FA:5A:4E:75:
97:DA:A0:30:02:31:5C
Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : 5C:DC:43:92:FE:E6:AB:45:44:B1:5E:9A:D4:56:E6:10:
37:FB:D5:FA:47:DC:A1:73:94:B2:5E:E6:F6:C7:0E:CA
Timestamp : Oct 27 19:12:58.855 2020 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:46:02:21:00:DF:6E:3B:70:6E:DD:8B:49:BA:F6:75:
68:88:6F:15:8F:88:1A:49:24:2D:E7:CA:55:C4:7A:2A:
23:B4:0E:EB:99:02:21:00:92:3B:19:E4:79:72:0A:26:
0A:4E:65:F8:5A:13:7B:0C:5B:00:D9:E0:93:61:8B:DD:
FA:C3:7E:11:97:95:97:B6
Key Usage: Digital Signature, Key Encipherment
Basic Constraints: CA:FALSE
Subject Alternative Name: DNS:contactlenses.co.uk
DNS:*.contactlenses.co.uk
Technical

DNS Lookup

A Records

Host IP Address Class TTL
contactlenses.co.uk. 148.251.175.35 IN 3599

NS Records

Host Nameserver Class TTL
contactlenses.co.uk. alpha.webforge.com.ua. IN 3599
contactlenses.co.uk. s7.singles.co.uk. IN 3599
contactlenses.co.uk. s5.contactlenses.co.uk. IN 3599

MX Records

Priority Host Server Class TTL
10 contactlenses.co.uk. s5.contactlenses.co.uk. IN 3599

SOA Records

Domain Name Primary NS Responsible Email TTL
contactlenses.co.uk. s7.singles.co.uk. hostmaster.s7.singles.co.uk. 3599

TXT Records

Host Value Class TTL
contactlenses.co.uk. tu0oqttbviaki22ilfs3tntd9h IN 3599
contactlenses.co.uk. v=spf1 IN 3599
contactlenses.co.uk. r80ivssfm945mm71jdggca63c7 IN 3599
contactlenses.co.uk. qqdbthlc3av1709ctunv54tacs IN 3599

HTTP Response Headers

HTTP-Code: HTTP/1.1 200 OK
Date: 21st November, 2020
Server: Apache
Expires: 19th November, 1981
Cache-Control: no-store, no-cache, must-revalidate, public
Content-Type: text/html; charset=UTF-8
X-Frame-Options: SAMEORIGIN
Set-Cookie: *
Pragma: no-cache
X-UA-Compatible: IE=Edge,chrome=1

Whois Lookup

Created: 14th April, 1997
Changed: 20th June, 2020
Expires: 14th April, 2021
Registrar: UK2 Limited [Tag = UK2NET]
URL: http://uk2.net
Relevant dates:
Status:
Nameservers: s5.contactlenses.co.uk
s7.singles.co.uk
Full Whois:
Domain name:
contactlenses.co.uk

Data validation:
Nominet was not able to match the registrant's name and/or address against a 3rd party source on 20-Jun-2020

Registrar:
UK2 Limited [Tag = UK2NET]
URL: http://uk2.net

Relevant dates:
Registered on: 14-Apr-1997
Expiry date: 14-Apr-2021
Last updated: 20-Jun-2020

Registration status:
Registered until expiry date.

Name servers:
s5.contactlenses.co.uk 148.251.175.34
s7.singles.co.uk 176.9.54.131

WHOIS lookup made at 23:12:48 21-Nov-2020

--
This WHOIS information is provided for free by Nominet UK the central registry
for .uk domain names. This information and the .uk WHOIS are:

Copyright Nominet UK 1996 - 2020.

You may not access the .uk WHOIS or use any data from it except as permitted
by the terms of use available in full at https://www.nominet.uk/whoisterms,
which includes restrictions on: (A) use of the data for advertising, or its
repackaging, recompilation, redistribution or reuse (B) obscuring, removing
or hiding any or all of this notice and (C) exceeding query rate or volume
limits. The data is provided on an 'as-is' basis and may lag behind the
register. Access may be withdrawn or restricted at any time.
View Raw Whois

Nameservers

Name IP Address
s5.contactlenses.co.uk 148.251.175.34
s7.singles.co.uk 176.9.54.131
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