A person who can differentiate just two main colors
a person who possesses just two associated with three typical primary color-sensations; a red-blind or green-blind individual. The definition of presupposes the correctness of Young-Helmholtz concept of color-vision.
someone with the different kinds of dichromacy
somebody who can distinguish just two main colors
One who possesses just two regarding the three regular major color-sensations; a red-blind or green-blind person. The term presupposes the correctness of the Young-Helmholtz theory of color-vision.
people with some of the various forms of dichromacy
A figure of speech in which the expression is an evident exaggeration of the meaning intended to be conveyed or by which things are represented as much greater or less better or worse than they really are a statement exaggerated fancifully through excitement or for effect...