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Colour Blindness

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Jimmy Coolcat

on 3 May 2010

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Transcript of Colour Blindness

Colour Blindness, What is it? Colour blindness or color vision deficiency is the inability to perceive differences between some of the colors that others can distinguish. It is most often of genetic nature, but may also occur because of eye, nerve, or brain damage, or exposure to certain chemicals. Boys are far more likely to be colour-blind. In fact, if you know 12 boys, one of them is probably at least a little color-blind. The area at the back of the eye, called the retina, is sensitive to light and colour. It contains specialized cells, called cones, that respond to colour. There are three types of cone cells. One responds best to red light, one to green light, and one to blue light. When a specific type of cone cell doesn't work properly, a person will have trouble seeing the colour that particular cone cell responds to. For example, a person with red colour blindness has a defect in red cone cells.

QUICK FACTS Bulls are actually colourblind, it is the motion of a red cape which angers them, not the color itself.
Everyone is colourblind at birth
Most colourblind people get tired of the "What colour is this" questions from their peers by age 13.

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