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Related Experiment Videos

Binocularity in comitant strabismus: II. Objective evaluation with visual evoked responses.

E C Campos, C Chiesi

    Documenta Ophthalmologica. Advances in Ophthalmology
    |September 30, 1983
    PubMed
    Summary
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    This study uses visual evoked responses (VER) to objectively assess anomalous binocular vision (ABV) in strabismus patients. VER can differentiate normal binocularity from strabismic patients with anomalous retinal correspondence (ARC).

    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Visual electrophysiology

    Background:

    • Psychophysical studies suggested binocular vision in small-angle strabismus without suppression.
    • Electrophysiological validation of these findings in strabismus is needed.

    Purpose of the Study:

    • To objectively assess binocularity in strabismus using visual evoked responses (VER).
    • To investigate anomalous binocular vision (ABV) and anomalous retinal correspondence (ARC) in strabismus.
    • To correlate psychophysical and electrophysiological data.

    Main Methods:

    • Review of literature on VER for binocularity assessment in normals and strabismics.
    • Recording of binocular VER in patients with small and large angle strabismus.
    • Development of a method using neutral filters to differentiate normal vs. strabismic VER.

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    Main Results:

    • VER can objectively detect ABV sustained by ARC in small-angle strabismus.
    • This type of binocularity is absent in large angle deviations.
    • A correlation between psychophysical and electrophysiological findings was established.

    Conclusions:

    • Visual evoked responses provide an objective measure for assessing anomalous binocular vision in strabismus.
    • VER can differentiate between normal binocularity and strabismic binocularity with ARC.
    • A simple filter method aids in distinguishing these conditions.