BSIP ESTIOT / SCIENCE PHOTO LIBRARY BSIP ESTIOT / SCIENCE PHOTO LIBRARY
Colour blindness. Artwork showing the effect of monochromatism colour blindness on a picture of a ladybird on a leaf. The lower right part of the picture is as an unaffected person would see it, and the upper left represents the view of a person with monochromatic vision. True monochromatism, in which vision is entirely in shades of grey as here, is extremely rare, affecting as few as one person in 100,000. Other types of colour vision deficiency include Daltonism, or red-green colour blindness: difficulty in differentiating between red and green. Colour blindness is a genetic disorder which affects about 10% of people in some form. It is about ten times more common in men.
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