Subnormal color-perception frequently presents a grotesqueness which always subtly attracts the attention of students of medicine and psychology. That there is a physical basis for this aberration of the sense of sight, is proved, although at times it seems necessary to search for the origin of the peculiar condition by assuming some metaphysical or vital perversion of energy of the human body causing an incoördination of neuronic action from the impinging light rays. Speculation, however, may be indulged in as to this type.
The more intimate we become with the knowledge of family histories found in such types of diseased functions, the more apt we shall be in determining the possible atavistic tendency to this state; and in knowing this possibility, we are as physicians made better able to cope with the broad subject of consanguinity of marriage or, indeed, of marital union of persons having any "weak points" in
PEARCE FS. HEREDITARY SUBNORMAL COLOR-PERCEPTION.. JAMA. 1901;XXXVI(10):624–625. doi:10.1001/jama.1901.52470100016001d