Color blindness
By Martin the king

Color blindness means that you have trouble seeing red, green, or blue or a mix of these colors. It's rare that a person sees no color at all.

Color blindness is also called a color vision problem.

A color vision problem can change your life. It may make it harder to learn and read, and you may not be able to have certain careers. But children and adults with color vision problems can learn to make up for their problems seeing color, http://www.webmd.com/eye-health/tc/color-blindness-topic-overview

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