has material basis in germline mutation in OPN1LW color vision disorder eye disorder red color blindness https://github.com/monarch-initiative/mondo/issues/4521 https://www.malacards.org/card/colorblindness_partial_protan_series MEDGEN:56350 red color blindness Protanopia is a severe type of color vision deficiency caused by the complete absence of red retinal photoreceptors. Protans have difficulties distinguishing between blue and green colors and also between red and green colors. It is a form of dichromatism in which the subject can only perceive light wavelengths from 400 to 650 nm, instead of the usual 700 nm. Pure reds cannot be seen, instead appearing black; purple colors cannot be distinguished from blues; more orange-tinted reds may appear as very dim yellows, and all orange-yellow-green shades of too long a wavelength to stimulate the blue receptors appear as a similar yellow hue. It is hereditary, sex-linked, and present in 1% of males. colorblindness, protan protan defect EFO:0005580 ICD9:368.51 MONDO:0010565 partial achromatopsia, protan type protanopia colorblindness, partial, protan series OMIM:303900 UMLS:C0155015 Orphanet:319691 SCTID:51445007 DOID:13910 ICD10CM:H53.54 CBP hereditary neurological disease