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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:Reduced contrast sensitivity
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Accession:HP:0032036 term browser browse the term
Definition:An abnormality in perception of contrast. Spatial contrast is a physical dimension referring to the light-dark transition of a border or an edge in an image that delineates the existence of a pattern or an object. Contrast sensitivity refers to a measure of how much contrast a person requires to see a target. Contrast-sensitivity measurements differ from acuity measurements; acuity is a measure of the spatial-resolving ability of the visual system under conditions of very high contrast, whereas contrast sensitivity is a measure of the threshold contrast for seeing a target.
Synonyms:exact_synonym: Abnormal contrast sensitivity

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  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of the eye 0
        Abnormal eye physiology 0
          Abnormality of vision 0
            Reduced contrast sensitivity 0
              Abnormal Pelli Robson contrast sensitivity chart test 0
              Abnormal Vistech contrast sensitivity test 0
              Mildly reduced contrast sensitivity 0
              Moderately reduced contrast sensitivity 0
              Severely reduced contrast sensitivity 0
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