Rare diseases · Sign or symptom
Cone monochromacy
HP:0011517
What it means
The condition of having both rods and cones, but only a single kind of cone. Affected individuals have good pattern vision in daylight, but cannot distinguish between colors.
There are three differing forms of cone monochromacy, named according to the residual functioning cone class, (1) blue cone (S-cone) monochromacy, green cone (M-cone) monochromacy, and red cone (L-cone) monochromacy.
Part of the broader category
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Start free with EleplanThis page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.