matthias asked
Color blindness, (also known as Dyschromatopsia) or color vision deficiency, in humans is the inability to perceive differences between some or all colors that other people can distinguish. It is most often of genetic nature, but may also occur because of eye, nerve, or brain damage, or due to exposure to certain chemicals. (Wikipedia) About 8% of men and 0.5% of women suffer from some kind of colour blindness.
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