Color Blindness

• Color Blindness is when a person has the inability to percieve the differences between some or all colors, that other people can distinguish.

Usually Genetic, but can also occur when you have eye, nerve, or brain damage, or an exposure to certain chemicals.
Red-green deficiency (deuteranopia). This is the most commonly diagnosed deficiency. People with this condition cannot distinguish certain shades of red and green.
Blue-yellow deficiency (tritanopia). This is a rare condition where it is difficult to distinguish between blue and green. Yellow can appear as a pale grey or purple.

Color blindness 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 might also occur because of eye, nerve, or brain damage, or due to exposure to certain chemicals..

**Color blindness is usually labelled as a disability; however, in select situations color blind people have advantages over people with a full color range. Color blind hunters are better at picking out prey against a confusing background, and the military have found that color blind soldiers can sometimes see through camouflage that fools everyone else.
http://www.wordiq.com/definition/Color_blindness

Red-green deficiency (deuteranopia). This is the most commonly diagnosed deficiency. People with this condition cannot distinguish certain shades of red and green.
Blue-yellow deficiency (tritanopia). This is a rare condition where it is difficult to distinguish between blue and green. Yellow can appear as a pale grey or purple.
http://etherealmind.com/colour-blindness-network-diagrams-reliability/