Colour vision deficiency is a very common disorder, affecting up to 8% of males but only 0.5% of females^1^. It is sometimes referred to as ‘colour blindness’, but the inability to see any colour at all is extremely rare, and more usually sufferers are more likely to confuse some colours whilst retaining the ability to distinguish others. Most commonly, people will have problems distinguishing between red and green.
Colour blindness is a genetic condition usually passed from mother to son, but it can also result from some diseases such as^2^:
Other causes include some medications or exposure to chemicals such as fertilisers, and the ability to see colours can also lessen with age^2^.
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