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Dynamic measures of vergence accommodation

V V Krishnan, D Shirachi, L Stark

    American Journal of Optometry and Physiological Optics
    |July 1, 1977
    PubMed
    Summary
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    Dynamic measures of vergence accommodation (VG-ACC) were challenging due to eye rotation. A new dynamic optometer enables accurate VG-ACC measurements, revealing response latencies between vergence and accommodation.

    Area of Science:

    • Ophthalmology
    • Vision Science
    • Neuroscience

    Background:

    • Accurate dynamic measures of vergence accommodation (VG-ACC) are crucial for understanding the triadic near response.
    • Eyeball rotation typically complicates obtaining reliable accommodative measures.

    Purpose of the Study:

    • To develop and validate a dynamic optometer capable of measuring VG-ACC responses.
    • To assess the feasibility of using a novel dynamic optometer for precise VG-ACC analysis.

    Main Methods:

    • Utilized a dynamic optometer employing the third Purkinje image.
    • Ensured the optometer's insensitivity to minor eyeball rotations.
    • Collected and analyzed dynamic VG-ACC responses.

    Main Results:

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    • Demonstrated the feasibility of dynamic VG-ACC measurement with the new optometer.
    • Found average VG-ACC latency to be 260 msec.
    • Observed VG-ACC dynamic features similar to other near triad components.

    Conclusions:

    • The developed dynamic optometer effectively measures VG-ACC responses.
    • VG-ACC latency falls between disparity vergence and accommodation latencies.
    • This method provides a new tool for analyzing the near triad response.