Too often, accessibility is seen as a checklist, but it's much more complex than that. We might be using a good contrast for our colors, but then, if these colors are perceived very differently by people, it can make interfaces extremely difficult to use.
Different people perceive colors differently. Around 300 million people are affected by color weakness or colorblindness. (Large preview) When we speak about colors, we should distinguish between two different conditions that people might have.
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