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The Human Phenotype Ontology (HPO) is downloaded weekly from The file downloaded is considered the "last stable build" available for the ontology. For more about the HPO, view their website at

Term:Cone monochromacy
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Accession:HP:0011517 term browser browse the term
Definition: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.
Comment: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.
Synonyms:xref: UMLS:C4023318

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  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of the eye 0
        Abnormal eye physiology 0
          Abnormality of vision 0
            Color vision defect 0
              Monochromacy 0
                Cone monochromacy 0
                  Blue cone monochromacy 0
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