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Related Experiment Videos

Sensitivity deficits consistent with aberrant crossed visual pathways in human albinos

R St John, B Timney

    Investigative Ophthalmology & Visual Science
    |December 1, 1981
    PubMed
    Summary
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    Human albinos with abnormally crossed visual pathways show varied visual abilities. Some albinos exhibit degraded temporal retina sensitivity, indicating visual pathway abnormalities impact visual perception.

    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Human Genetics

    Background:

    • Human albinos exhibit abnormally crossed visual pathways, supported by anatomical and electrophysiological evidence.
    • These visual pathway anomalies may influence visual perception and abilities.

    Purpose of the Study:

    • To investigate the perceptual consequences of abnormally crossed visual pathways in albinos.
    • To assess visual abilities, including visual fields and contrast sensitivity, in individuals with albinism.

    Main Methods:

    • Visual fields were measured in 12 oculocutaneous albinos and 1 ocular albino.
    • Contrast sensitivity functions were obtained for central, nasal, and temporal retinas in seven subjects.

    Main Results:

    Related Experiment Videos

  • Visual field dimensions varied, with no loss correlating to aberrant projection origins.
  • Albino subjects were classified into two groups based on contrast sensitivity.
  • One group showed uniform sensitivity across retinal regions; the other displayed reduced temporal retina sensitivity.

    • Conclusions:

    • Aberrant visual pathways in some albinos can lead to degraded visual information processing.
    • Albinism-associated visual pathway abnormalities have demonstrable perceptual consequences, particularly affecting temporal retina sensitivity.