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There have been some cases where people have been dichromatic in one eye only.

The animals are also dichromatic, meaning they only see blues, greens, and yellows—though Pigcasso's palette also has red.

The researchers concluded that the familiar gray tree squirrels, Sciurus carolinensis, have dichromatic color vision.

Dogs have such a "dichromatic" view of the world as shown in this image of an owner's legs.

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.