Question

what is the basic cause of color blindness?????
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Answer 1

Lack of cone cells on retina is the main reason of colour blindness.

Answer 2

Color blindness is a genetic condition caused by a difference in how one or more of the light-sensitive cells found in the retina of the eye respond to certain colors. These cells, called cones, sense wavelengths of light, and enable the retina to distinguish between colors.
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