Hering theory of color vision
a theory of color vision postulating that there are three sets of receptors, one of which is sensitive to white and black, another to red and green, and the third to yellow and blue. The breaking down (catabolism) of these substances is supposed to yield one member of these pairs (white, red, or yellow), while the building up (anabolism) of the same substances yields the other (black, green, or blue). Color blindness results from the absence of one or more of the chromatic processes. See opponent process theory of color vision. [proposed in 1875 by Ewald Hering]