People with only one or two types of cones on their retinas experience different forms of colour-blindness. Which theory of colour vision is supported by this evidence?

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The trichromatic theory, also known as the Young-Helmholtz theory, states that there are three types of cones in the retina that are sensitive to different wavelengths of light: red, green and blue. These three colours can be combined to create the perception of all other colours. However, people with only one or two types of cones on their retina cannot differentiate between certain colours, resulting in different forms of colour-blindness. This evidence supports the trichromatic theory, which suggests that the perception of colour is based on the activity of three types of cones.

People with Only One or Two Types of Cones on Their