Color blindness usually affects a person’s ability to tell the difference between shades of red and green or shades of blue and yellow. Complete color blindness, which is very rare, causes a person to see most objects in shades of gray.

Color blindness occurs when light-sensing receptors in the eye do not work properly.

If you think you have this condition, contact your doctor. Although most color blindness cannot be cured or treated, you can learn simple ways to manage your difficulty seeing color differences. Some cases of color blindness may point to another illness that will need treatment.

Most color blindness is inherited. Less frequently, color blindness is caused by a disease that affects the optic nerve or retina. This is referred to as acquired color blindness.

Anatomy of the Eye
Normal Anatomy of the Eye
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