1 : having or exhibiting two colors. 2 : of, relating to, or exhibiting dichromatism.

What is Monochromacy and dichromacy?

Dichromacy, when one of the cone pigments is missing and colour is reduced to the green-red distinction only or the blue-yellow distinction only. Monochromacy, when two of the cones are not functional. Vision reduced to blacks, whites, and greys.

What color is dichromacy?

Dichromatic individuals are ordinarily unable to distinguish between red and green. Blindness to red is known as protanopia, a state in which the red cones are absent, leaving only the cones that absorb blue and green light.