A deficiency of colour perception in which the red-sensitive pigment in cones is decreased. ... Origin: G. Protos, first, + anomalia, anomaly ... (05 Mar 2000) ... 
(pro″tә-nom´ә-le) a type of anomalous trichromatic vision in which the first, red-sensitive cones have decreased sensitivity.
Type: Term Pronunciation: prō-tă-nom′ă-lē Definitions: 1. A deficiency of color perception in which the red-sensitive pigment in cones is decreased.
protanomaly 1. A deficiency of color perception in which the red-sensitive pigment in cones is decreased. 2. A defect of vision characterized by a diminished response of the retina to red.
a defect of vision characterized by a diminished response of the retina to red.