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Effect of accommodation on visually evoked response

J V Cornetta, R G Newton, B G Gilman

    American Journal of Optometry and Physiological Optics
    |December 1, 1981
    PubMed
    Summary
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    Accommodation significantly alters visually evoked response (VER) amplitude and implicit time. This research highlights the need to control accommodative stimulus during VER clinical evaluations to ensure accurate results.

    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Physiological Optics

    Background:

    • The visually evoked response (VER) is a key electrophysiological measure of visual pathway function.
    • Accommodation, the eye's ability to change focus, is known to influence visual processing.

    Purpose of the Study:

    • To quantify the impact of varying levels of accommodation on VER amplitude and implicit time.
    • To establish the relationship between diopters of accommodation and changes in VER parameters.

    Main Methods:

    • Participants underwent electrophysiological testing to record VERs.
    • Controlled changes in accommodative stimulus were introduced.
    • VER amplitude and implicit time were measured at different levels of accommodation.

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    Main Results:

    • A consistent decrease in VER amplitude was observed, averaging approximately 1 muV per diopter of accommodation.
    • VER implicit time showed a corresponding increase, averaging about 1.5 msec per diopter of accommodation.
    • These changes indicate a direct correlation between accommodation and VER characteristics.

    Conclusions:

    • Accommodation significantly affects VER amplitude and implicit time.
    • Clinical evaluations of VER require careful control of accommodative state to avoid confounding results.
    • Understanding these effects is crucial for accurate interpretation of VER in ophthalmological and neurological assessments.