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Related Experiment Videos

Biofeedback of accommodation to reduce functional myopia

J N Trachtman, V Giambalvo, J Feldman

    Biofeedback and Self-Regulation
    |December 1, 1981
    PubMed
    Summary

    Functional myopia, an eye condition caused by ciliary muscle spasms, can be voluntarily controlled. Biofeedback training successfully reduced myopia and improved visual acuity in adult subjects.

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    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Physiology

    Background:

    • Functional myopia is characterized by refractive error caused by ciliary muscle spasm.
    • Accommodation, the adjustment of the crystalline lens's refractive power, is regulated by the autonomic nervous system.
    • Prior research suggests voluntary control over accommodation is achievable through biofeedback.

    Observation:

    • This study explored biofeedback's efficacy in managing functional myopia.
    • A double-reversal, multiple-baseline design was employed for the experiment.
    • Three adult male participants were involved in the study.

    Findings:

    • Participants achieved a 1/2-diopter reduction in myopia between baseline and subsequent measurements.
    • Greater reductions in myopia and increases in visual acuity were observed during biofeedback periods.
    • Functional myopia was demonstrated to be subject to voluntary control.

    Implications:

    • Biofeedback training offers a potential method for managing functional myopia.
    • The findings suggest that individuals can exert conscious control over their eye's refractive state.
    • Further research could explore generalization to non-experimental settings and broader populations.

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