Other Free Encyclopedias » 21st Century Webster's Family Encyclopedia » 21st Century Webster's Family Encyclopedia - Clyde to Constable, John

Color blindness

Color blindness, inability to tell certain colors apart. An inherited trait, color blindness is caused by a disorder of the cones in the retina of the eye. The commonest form is a difficulty in distinguishing red from green. It is usually found in males. Total color blindness, which is rare, causes a person to see only black, white, and various shades of gray.

See also: Spectrum.

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