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Eye disorders

Colour blindness is the inability to differentiate between different colours.

The most common type is red-green colour blindness. This occurs in 8 percent of males and 0.4 percent of females. It occurs when either the red or green cones are not present or not functioning properly. People with this problem are not completely unable to see red or green, but often confuse the two colours.

This is an inherited disorder and affects men more commonly since the capacity for colour vision is located on the X chromosome. (Women have two X chromosomes, so the probability of inheriting at least one X with normal colour vision is high; men have only one X chromosome to work with).

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