protan
/ˈprəʊtən/Ophthalmology
noun
Protanopia or protanomaly (now rare ); a person affected by either of these conditions.
adjective
Of, relating to, or affected by protanopia or protanomaly; protanopic or protanomalous.
Origin
1940s. Partly shortened from protanopia, and partly shortened from protanomaly.