protanopia

Protanopia is a clinical term used primarily in ophthalmology and genetics to describe a specific form of dichromacy. It is distinct from protanomaly, which is a deficiency or weakness in red perception rather than a total absence. Because it describes a permanent physiological condition of the retina, it is used in medical diagnoses and scientific literature rather than casual conversation.

As a medical condition denoting a specific state of color vision deficiency, the term is treated as an uncountable noun. It refers to the condition itself rather than individual instances of the disorder, meaning it does not take a plural form in standard medical usage.