Information Page Color Test Charts Conversations on colorblindness References Home Color blindness is a result of a defect in the cone receptors in the retinas of the eyes.
Color blindness is a male dominant trait, but is carried by the female.
One male in twenty suffers from some form of color blindness, but only one in several hundred females are color blind. Color blindness is the general term used by most people but maybe in this politically correct world we should refer to it as chromatically challenged. However in reality the symptoms range from an inability to see one color, or shades of one color, to a lack of ability to see any color at all. Because it is a result of a cone defect, colorblind people are also prone to night blindness, and may have extreme difficulty in seeing in low light, or their color perception may be greatly reduced in low light. What color blind people actually see is hard to explain or describe to one who isn't colorblind, and probably equally hard to determine by someone else.