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from Wikipedia, the free encyclopedia

Color blindness

Color blindness, 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.

Note: This article excerpts material from the Wikipedia article "Color blindness", which is released under the GNU Free Documentation License.

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