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Monocular vergence movements produced by external visual feedback

R E Manny

    American Journal of Optometry and Physiological Optics
    |April 1, 1980
    PubMed
    Summary
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    Subjects learned to control eye movements (monocular lateral vergence) using visual feedback. This study demonstrates the ability to voluntarily produce abduction and adduction, with one subject showing changes in eye alignment after training.

    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Vision Science

    Background:

    • Monocular eye movements, specifically lateral vergence (duction), are crucial for visual function.
    • Understanding the neural control of vergence is essential for diagnosing and treating various eye movement disorders.

    Purpose of the Study:

    • To investigate the efficacy of external visual feedback in training voluntary monocular lateral vergence movements.
    • To assess the ability of individuals with normal binocular vision to produce abduction and adduction using feedback.

    Main Methods:

    • An external visual feedback system was employed, utilizing an alternating magnetic field to monitor eye position.
    • Eye position data was displayed on an oscilloscope screen, providing real-time feedback to subjects.
    • Three subjects with normal binocular vision participated in the training protocol.

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    Main Results:

    • All three subjects successfully produced both unilateral abduction (outward movement) and adduction (inward movement) of the eye.
    • One subject exhibited an increase in exophoria (outward eye turn tendency) and a decrease in the accommodative convergence/accommodation (AC/A) ratio post-feedback training.

    Conclusions:

    • External visual feedback is an effective method for training voluntary monocular lateral vergence movements.
    • The observed changes in phoria and AC/A ratio suggest potential adaptive plasticity in the vergence system following feedback-induced training.