Severely deficient color perception, typically with monochromacy and reduced visual acuity. the atypical form can include normal visual acuity with pseudomonochromacy.

Achromatopsia, also known as rod monochromacy, is a medical syndrome that exhibits symptoms relating to five conditions, most notably monochromacy. Historically, the name referred to monochromacy in general, but now typically refers only to an autosomal recessive congenital color vision condition...