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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:0000662 term browser browse the term
Definition:Inability to see well at night or in poor light.
Synonyms:exact_synonym: Night blindness;   Poor night vision
 related_synonym: Difficulties with night vision
 alt_id: HP:0007653;   HP:0007725;   HP:0007865;   HP:0007895
 xref: MESH:D009755;   SNOMEDCT_US:65194006;   UMLS:C0028077;   UMLS:C4020885

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Term paths to the root
Path 1
Term Annotations click to browse term
  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of the eye 0
        Abnormal eye physiology 0
          Abnormality of vision 0
            Nyctalopia 0
              Adult-onset night blindness 0
              Congenital stationary night blindness + 0
              Progressive night blindness 0
paths to the root