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Visual system anomalies in human ocular albinos.

D Creel, F E O'Donnell, C J Witkop

    Science (New York, N.Y.)
    |September 8, 1978
    PubMed
    Summary
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    Human ocular albinism shows significant brainwave asymmetry, suggesting disorganized visual pathways. This optic nerve projection issue is linked to a lack of eye pigment, not general pigment defects.

    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Genetics

    Background:

    • Ocular albinism is a genetic disorder characterized by reduced iridial and retinal pigmentation.
    • Visual pathway organization in albinism is not fully understood.
    • Previous studies suggest visual system abnormalities in various forms of albinism.

    Purpose of the Study:

    • To investigate the visual pathway organization in human ocular albinism.
    • To determine if abnormal projections are associated with ocular pigment levels.
    • To compare findings in human albinism with animal models.

    Main Methods:

    • Recording visually evoked potentials (VEPs) from human subjects with ocular albinism.
    • Utilizing monocular stimulation to assess hemispheric responses.

    Related Experiment Videos

  • Analyzing VEPs for patterns of asymmetry.

    • Main Results:

    • Significant hemispheric asymmetry was observed in VEPs following monocular stimulation in human ocular albinos.
    • This asymmetry indicates a disorganization of retinogeniculostriate projections.
    • The observed projection abnormalities were linked to the lack of ocular pigment.

    Conclusions:

    • Human ocular albinism exhibits disorganized retinogeniculostriate projections, similar to albinism in mammals.
    • Abnormal optic projections in ocular albinism are a consequence of reduced ocular pigment.
    • These visual pathway defects are not linked to generalized pigment deficiencies.