The trichromatic theory of color vision asserts that there are three kinds of cones in the eye.

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The trichromatic theory of color vision also known as the Young-Helmholtz theory, proposes that there are three types of cones in the eye that are responsible for color vision. These cones are sensitive to three primary colors: red, green, and blue. The combination of these three colors allows the eye to perceive a wide range of colors.

The Trichromatic Theory of Color Vision Asserts That There Are