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Colour blindness

The most common form of 'colour blindness' is red-green colour deficiency, which affects one in 12 males. This is not actually blindness, but a difficulty in distinguishing shades between red and green. It is caused by a change to or loss of the light responsive chemical in certain photoreceptors. Total absence of colour vision, where everything is seen in shades of black and grey, is very rare, and is usually caused by brain damage.

Ishihara colour-blindness tests.
Ishihara colour-blindness tests.
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