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First of all most color impaired can see all colors. Very few color blind people can only see in black in white (less than 1%).
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Color blindness is the inability to perceive differences between some colors that other people can distinguish.
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It is most often of genetic nature, but might also occur because of eye, nerve or brain damage or due to use of some chemical substances.
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5%-8% of men and 0.5% of women are colorblind.
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A color-defective male always inherits his deficiency from his mother, the mother however is not colorblind.
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Bulls are colorblind, it is the motion of a red cape which angers them, not the color itself.
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In World War II, colorblind men were sent on special missions, because their decreased ability to see green led to an increased ability to see through or detect camouflage.
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Famous People: Mr. Rogers
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Everyone is colorblind at birth
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Emerson Moser, who was Crayola's senior crayon maker revealed upon his retirement that he was blue-green colorblind and could not see all the colors!

