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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

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Accession:HP:0007803 term browser browse the term
Definition:Complete color blindness, a complete inability to distinguish colors. Affected persons cannot perceive colors, but only shades of gray.
Comment:Rod monochromacy is the condition of having only rods in the retina. A rod monochromat is truly unable to see any color and can see only shades of gray.
Synonyms:exact_synonym: Complete achromatopsia
 related_synonym: TOTAL COLORBLINDNESS
 alt_id: HP:0007954
 xref: MESH:C536128;   MESH:D003117;   SNOMEDCT_US:56852002;   UMLS:C0152200;   UMLS:C1857618

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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
                Achromatopsia 0
                Cone monochromacy + 0
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