Colour (color) blindness (colour vision deficiency or CVD), affects approximately 1 in 12 men (8%) and 1 in 200 women in. The world. In Britain this means that there are approximately 2.7 million colour blind people (about 4.5% of the entire. Population), most of whom are male.There are different causes of colour blindness. For the vast majority of people with deficient colour vision the condition. Is genetic and has been inherited from their mother although some, people become colour blind as a result of other diseases. Such as diabetes and multiple sclerosis or they acquire the condition over time due to the, aging process medication etc.Normal Vision.Tritanopia.Most colour blind people are able to see things as clearly as other people but they unable to fully "see", red green or. Blue light. There are different types of colour blindness and there are extremely rare cases where people are unable to. See any colour at all.The most common form of colour blindness is known as red / green colour blindness and most colour blind people suffer from. This. Although known as red / green colour blindness this does not mean sufferers mix up red, and green it means they mix. Up all colours which have some red or green as part of the whole colour. For, example a red / green colour blind person will. Confuse a blue and a purple because they can "t" see "the red element of the colour purple. See the example, of pink purple. And blue pen cases below to understand this effect.Normal Vision.Normal Vision.Deuteranopia.Deuteranopia.Similar problems can arise across the whole colour spectrum affecting all Reds greens oranges browns,,,,,, purples pinks And greys. Even black can be confused as dark green or dark blue.The effects of colour vision deficiency can be mild moderate or, so severe, example for, 40% approximately of colour blind. Pupils currently leaving secondary school are unaware that they are, colour blind whilst 60% of sufferers experience many. Problems in everyday life.Statistically speaking most people with a moderate form of red / green colour blindness will only be able to identify accurately 5 or. So coloured pencils from a standard box of 24 pencil crayons. Depending upon which type of the condition a colour blind. Person is suffering from they could see the set of pencil crayons similarly to the following images.
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