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Published online 5 December 2005 | Nature | doi:10.1038/news051205-1

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Colour blindness may have hidden advantages

People with red-green colour blindness are better at discerning shades of khaki.

The most common form of colour blindness makes it difficult for those with the condition to distinguish between red and green. But scientists have found that it also helps these people to discern subtle shades of khaki that look identical to those with normal vision.

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