
(from the article `colour`) One of the most successful theories of colour vision, the trichromatic theory, was first proposed around 1801 by Thomas Young, an English physician, ...
Found on
http://www.britannica.com/eb/a-z/t/79

The theory that there are three types of color receptors that produce the primary color sensations of red, green, and blue.
Found on
https://www.encyclo.co.uk/local/22842

A theory of color vision that states that there are three different types of cones in the retina, which are sensitive to light of three different wavelengths. It is also called the Young-Helmholtz theory.
Found on
https://www.sparknotes.com/psychology/psych101/glossary/terms/
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