What is colour vision deficiency?
This article is about color deficiencies. For the term describing activities undertaken and services provided without regard to the racial characteristics, see Color blindness (race).
Color blindness, a color vision deficiency, is the inability to perceive differences between some of the colors that others 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. The English chemist John Dalton published the first scientific paper on the subject in 1798, “Extraordinary facts relating to the vision of colours”, after the realization of his own color blindness; because of Dalton’s work, the condition is sometimes called Daltonism, although this term is now used for a type of color blindness called deuteranopia.
Color blindness is usually classed as disability; in certain situations, however, color blind people have an advantage over people with normal color vision. There are some studies which conclude that color blind individuals are better at penetrating certain camouflages