--- title: Do we all see the same colours? Discovering how colour... description: Color blindness affects roughly 350 million people worldwide, and a color combination that passes WCAG AA contrast requirements (4.64:1) can become completely... canonical: https://daily.dev/posts/do-we-all-see-the-same-colours-discovering-how-colour-blindness-affects-colour-perception-and-acce-xkzgd2jqn twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Do we all see the same colours? Discovering how colour blindness affects colour perception and accessibility. | daily.dev og:description: Color blindness affects roughly 350 million people worldwide, and a color combination that passes WCAG AA contrast requirements (4.64:1) can become completely... og:url: https://daily.dev/posts/do-we-all-see-the-same-colours-discovering-how-colour-blindness-affects-colour-perception-and-acce-xkzgd2jqn og:image: https://api.daily.dev/og/posts/xKzgd2jQn.png og:image:alt: Do we all see the same colours? Discovering how colour blindness affects colour perception and accessibility. og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Do we all see the same colours? Discovering how colour blindness affects colour perception and accessibility. **[Anja P](https://daily.dev/sources/wvjsfjtde63pxqfasmxfo)** · [@anjapcodes](https://daily.dev/anjapcodes) · 0 upvotes · 0 comments ## Summary Color blindness affects roughly 350 million people worldwide, and a color combination that passes WCAG AA contrast requirements (4.64:1) can become completely inaccessible for users with color vision deficiencies. Using the Colorblindly Chrome extension, the post demonstrates how deuteranopia, protanopia, tritanopia, and achromatopsia each dramatically reduce perceived contrast ratios—sometimes to as low as 1.4:1. To address this, WCAG suggests a 7:1 contrast ratio as a threshold that compensates for color deficiency, and recommends never relying on color alone to convey information. Practical tools like contrast checkers and color blindness simulators are highlighted, alongside the importance of user testing with people who have color vision deficiencies. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Don’t just attend KubeCon \+ CloudNativeCon, Merge Forward your experience\!](https://daily.dev/posts/don-t-just-attend-kubecon-cloudnativecon-merge-forward-your-experience--l0rpp73x8) · CNCF · 1 upvotes · 0 comments - [Announcing H2 2026 KCDs](https://daily.dev/posts/announcing-h2-2026-kcds-m96goajm1) · CNCF · 1 upvotes · 0 comments - [Two months of Open Community Groups](https://daily.dev/posts/two-months-of-open-community-groups-asf52zhbs) · CNCF · 0 upvotes · 0 comments - [CNCF Unveils Schedule for KubeCon \+ CloudNativeCon Europe 2026](https://daily.dev/posts/cncf-unveils-schedule-for-kubecon-cloudnativecon-europe-2026-ikhcoa5cb) · CNCF · 2 upvotes · 0 comments - [CNCF Debuts KubeCon \+ CloudNativeCon Japan 2026 Schedule](https://daily.dev/posts/cncf-debuts-kubecon-cloudnativecon-japan-2026-schedule-xp5pyudub) · CNCF · 1 upvotes · 0 comments --- Tags: [#accessibility](https://daily.dev/tags/accessibility) [View this post on daily.dev](https://daily.dev/posts/do-we-all-see-the-same-colours-discovering-how-colour-blindness-affects-colour-perception-and-acce-xkzgd2jqn) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"DiscussionForumPosting","mainEntityOfPage":"https://daily.dev/posts/do-we-all-see-the-same-colours-discovering-how-colour-blindness-affects-colour-perception-and-acce-xkzgd2jqn","headline":"Do we all see the same colours?\n\nDiscovering how colour blindness affects colour perception and accessibility.","text":"Shared: TataNotes – Web Accessibility Personal Blog","url":"https://daily.dev/posts/do-we-all-see-the-same-colours-discovering-how-colour-blindness-affects-colour-perception-and-acce-xkzgd2jqn","datePublished":"2026-02-23T16:15:42.341Z","dateModified":"2026-02-23T16:16:18.379Z","author":{"@type":"Person","name":"Anja P","url":"https://daily.dev/anjapcodes","image":"https://media.daily.dev/image/upload/s--M_c0s8Ky--/f_auto/v1721658650/avatars/avatar_WVJSfJtDe63PxQFAsmXFO","description":"< Self-taught front-end developer + coding bootcamp grad, tech enthusiast + design lover + poet />","interactionStatistic":{"@type":"InteractionCounter","interactionType":{"@type":"EndorseAction"},"userInteractionCount":51380}},"image":"https://media.daily.dev/image/upload/s--1KxV4ohY--/f_auto/v1722860400/public/Placeholder%2007","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"sharedContent":{"@type":"WebPage","url":"https://api.daily.dev/r/M6d9c5tIa"},"isPartOf":{"@type":"WebPage","url":"https://daily.dev/sources/wvjsfjtde63pxqfasmxfo","name":"Anja P"}} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Anja P","item":"https://daily.dev/sources/wvjsfjtde63pxqfasmxfo"},{"@type":"ListItem","position":3,"name":"Do we all see the same colours?\n\nDiscovering how colour blindness affects colour perception and accessibility."}]} ```