Primates have full color vision because of the three- cone (trichromatic) system; color is a result of the ratio of activity of the three types of cones. In vertebrates, the main photopigment, rhodops...Primates have full color vision because of the three- cone (trichromatic) system; color is a result of the ratio of activity of the three types of cones. In vertebrates, the main photopigment, rhodopsin, has two main parts: an opsin, which is a membrane protein (in the form of a cluster of α-helices that span the membrane); and retinal, a molecule that absorbs light.
