The trichromatic theory of color vision states that we have three different types of cones. Each cone is sensitive to blue/yellow light, red/green light, or black/white light.

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The trichromatic theory of color vision states that we have three types of cones sensitive to different wavelengths of light: one most sensitive to blue (short wavelengths), one to green (medium wavelengths), and one to red (long wavelengths). There are no cones specifically for black/white light; black/white perception is related to the overall intensity of light detected by all types of cones and processed differently in the brain.

The Trichromatic Theory of Color Vision States That We Have