About 8 percent of men and 0.5 percent of women have some form of color vision deficiency. The most common types are protanopia (red weakness, ~1% of males), deuteranopia (green weakness, ~1% of males, the most common form), tritanopia (blue weakness, rare ~0.01%), and full achromatopsia (no color perception, very rare). Designs that rely on color alone to convey information (red / green status indicators, color-coded charts without other markers) become ambiguous or unusable for color-deficient viewers. This tool transforms any HEX color through each of the four major color-vision-deficiency models so you can see how your design colors would appear. The transforms use simplified linear matrices that approximate the major dichromacy types; real color perception is more nuanced.
Frequently asked questions
Deuteranomaly (green weakness) is the most common form overall, affecting roughly 5 percent of males in populations of European descent. Deuteranopia (complete green blindness) is rarer at about 1 percent. Protanopia / protanomaly (red) is similar in frequency. Tritanopia (blue) is much rarer, around 0.01 percent. Designs that work for deuteranopes generally work for protanopes too because the colors that confuse one group overlap heavily with the colors that confuse the other.
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