Inability to distinguish one or more colours. The human retina contains three types of cone cells that absorb light in different parts of the spectrum. Absence of these types causes colour blindness to red, green, and blue. Colour blindness is a sex-linked recessive trait (see recessiveness) 20 times more common in men than in women.
This entry comes from Encyclopædia Britannica Concise.
For the full entry on colour blindness, visit Britannica.com.
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