Blue cone monochromatism S cone monochromacy ICD10:H53.5 Blue cone monochromacy Color blindness, blue monocone monochromatic type MESH:C538165 OMIM:303700 Atypical X-linked achromatopsia S cone monochromatism Colour blindness, blue monocone monochromatic type X-linked incomplete achromatopsia orphanet UMLS:C2931753 Blue cone monochromatism (BCM) is a recessive X-linked disease characterized by severely impaired color discrimination, low visual acuity, nystagmus, and photophobia, due to dysfunction of the red (L) and green (M) cone photoreceptors. BCM is as an incomplete form of achromatopsia (see this term). UMLS:C0339537 MESH:C536238 Color-vision disease