monochromat
/ˌmɒnəˈkrəʊmət/ /ˈmɒnəkrə(ʊ)mat/(also monochromate) Ophthalmology
noun
A person with monochromatism.
Origin
Late 19th century; earliest use found in The Philosophical Review. From German Monochromat from ancient Greek μονο- + χρωματ-, χρῶμα colour.