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Do Horses See Colour?

While for ages it was commonly believed that all animals were completely colour-blind, research has shown that many animals – including dogs, cattle, pigs, goats, sheep, deer, and horses – can see some colour. In order to see in colour, an animal must have at least two different classes of receptors, which are light-sensitive cone cells in the retina (back) of the eye. Humans and primates typically have three different types of cone cells in the retina, called trichromatic (three colour) vision and can see four basic colours – red, green, blue, and yellow – as well as many intermediate hues. A horse's eye contains two classes of cone cell, and thus has dichromatic (two colour) vision. One cone class absorbs blue light (short wavelengths), and the other absorbs green-to-red colours (middle to long wavelengths), although horses do not see the green-to-red colours the same way as people, as their…

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