What are the colors that color blind can see?

There are a couple of different kinds of color blindness. The condition usually happens because of a defect in the mechanism that makes one or more of the pigments in the eye that allow the eye to respond differently to different wavelengths of light. The two most common types are "red-green" color blindness (the most common; such people have trouble distinguishing between red, orange, yellow, and green) and "blue-yellow" color blindness (people who have trouble distinguishing between blue and green and between red and yellow).

Depending on the exact genetic defect involved, this can range from a complete inability to distinguish between the colors, or varying degrees of difficulty in doing so. Much rarer is true color blindness, where the person cannot see any colors at all and everything appears as shades of gray.

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