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Adaptation of tonic accommodation.

C M Schor, C A Johnson, R B Post

    Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
    |January 1, 1984
    PubMed
    Summary
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    Short-term visual adaptation does not alter resting accommodation. Long-term adaptation shows a small tonic shift, unlike faster fusional vergence adaptation.

    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Visual Science

    Background:

    • Accommodation, the eye's ability to change focus, is crucial for clear vision.
    • Understanding the adaptive mechanisms of accommodation is essential for visual health.

    Purpose of the Study:

    • To investigate the effects of short-term and long-term monocular accommodative adaptation on resting focus.
    • To compare the duration and magnitude of accommodative adaptation with fusional vergence adaptation.

    Main Methods:

    • Monocular adaptation to near or far accommodative stimuli for short (<2 min) and long (30 min) durations.
    • Measurement of resting focus of accommodation before and after adaptation periods.
    • Analysis of accommodation recovery time and magnitude of after-effects.

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    Main Results:

    • Short-term adaptation (<2 min) did not yield consistent after-effects, with accommodation returning to baseline within 2-15 seconds.
    • Long-term adaptation (30 min) to a 6-D near stimulus resulted in a small average increase (0.5-D) in resting accommodation.
    • Accommodative tonic adaptation is a slow process requiring longer durations compared to fusional vergence adaptation.

    Conclusions:

    • Accommodation exhibits a small tonic adaptation that is dependent on prolonged exposure to stimuli.
    • The time course and magnitude of accommodative adaptation differ significantly from those observed in fusional vergence adaptation.
    • These findings contribute to understanding the plasticity and adaptive limits of the human accommodative system.