Color Vision Deficiency is a condition in which certain colors cannot be seen, and is most commonly due to an inherited condition. Red and Green color blindness is by far the most common form, about 99%, and causes problems in distinguishing reds and greens. Another color deficiency Blue/Yellow also exists, but is rare and there is no commonlyavailable test for it.



Color blindness is a result of certain cones misinterpreting the wavelengths that correspond to their respective colors. Red, green and blue colors have corresponding wavelengths. Red wavelengths are longest, green colors generate medium wavelengths, and blue colors are made of shorter wavelengths. If the green cones, for example, only respond to slightly longer wavelengths, green will be interpreted by the brain as red.