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Humans have trichromatic vision with three photoreceptors, where every color perceived can be made from a combination of red, green and blue.

But we don’t know whether that’s typical of a regular dichromat who doesn’t have the trichromatic eye to help wire up their brain.

We humans have a trichromatic view of the world, with cones aligned to red, green and blue.

Ecological and sexual selection converge in the cichlid visual system, where trichromatic colour vision, eight different opsin genes and novel spherical lenses promote sensitivity in the highly dimensional visual world of clear-water lakes12, 13, 14.

This shows that the visual power of these people is dichromatic and not trichromatic, as their power is limited to two colours, or pairs of colours, and does not extend to three.