protanomaly

This term is a specialized medical descriptor used primarily in ophthalmology and genetics. It describes a specific deficiency in the L-cone photoreceptors, which results in a shift in the perceived hue of red toward green, rather than a total absence of the ability to see red. It is distinct from protanopia, which refers to the complete absence of red-sensing cones.

As a clinical diagnosis, the word is used in formal medical reports and scientific literature. It is rarely encountered in casual conversation, where a speaker would more likely use the general term color blindness.