Deuteranopia

Deuteranomalous subjects show ordering behaviour similar to the behaviour of normal colour vision subjects, but less like their colleagues with deuteranopia.

A human with color blindness in the form of deuteranopia is missing the M cones and has only S and L cones present, resulting in a neutral point where the spectral absorption curves of the remaining pigments cross.

Dichromacy is a moderately severe color vision defect. It is hereditary and, in the case of protanopia or deuteranopia, sex-linked, affecting predominantly males.