Color blindness is the inability or decreased ability to see color under normal lighting conditions. Color blindness affects a great percentage of the population There is no actual blindness but there is a deficiency of color vision. The cause of color blindness is a fault in the development of one or more sets of retinal cones that perceive color in light and transmit that information to the optic nerve. This type of color blindness is usually a sex linked condition. The genes that produce photo pigments are carried on the X chromosome. If some of these genes are missing or damaged, color blindness will be more prominent in males than in females because males only have one X chromosome. Color blindness can also be produced by physical or chemical damage to the eye, the optic nerve, or parts of the brain. Color blindness is classified as a mild disability, but there are some instances where it can give an advantage. There is a study suggesting that people with some types of color blindness can distinguish colors that people with normal color vision are not able to distinguish.