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Fatigue of accommodation: changes in accommodation after visual work.

R G Pigion, R J Miller

    American Journal of Optometry and Physiological Optics
    |December 1, 1985
    PubMed
    Summary
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    Prolonged visual work did not alter static accommodation. However, dark focus accommodation shifted inward after near target viewing and dark exposure, suggesting implications for understanding accommodative fatigue.

    Area of Science:

    • Ophthalmology
    • Optometry
    • Vision Science

    Background:

    • Visual fatigue is a common complaint associated with prolonged visual tasks.
    • Understanding the underlying mechanisms of accommodative fatigue is crucial for developing effective interventions.
    • Current theories, including classical and dual-innervation accommodation, offer different explanations for accommodative responses.

    Purpose of the Study:

    • To investigate the effects of prolonged visual work on accommodation.
    • To compare the explanatory power of classical accommodation theory versus dual-innervation accommodation theory regarding visual fatigue.
    • To determine how near work and dark exposure influence accommodative responses and dark focus.

    Main Methods:

    • Twenty young adult males participated in the study.

    Related Experiment Videos

  • Accommodation responses were measured using a laser optometer.
  • Fatigue sessions involved 1-hour of near target viewing, far target viewing, or dark exposure.

    • Main Results:

    • No significant changes in static accommodation for near or far targets were observed after any fatigue session.
    • Dark focus accommodation showed an inward shift following near target viewing.
    • Prolonged viewing in darkness also resulted in an inward shift of dark focus accommodation.

    Conclusions:

    • Classical accommodation theory may not fully explain visual fatigue from prolonged near work.
    • Changes in dark focus accommodation suggest a potential mechanism related to visual fatigue.
    • Further research is needed to elucidate the complex relationship between visual tasks, accommodative responses, and fatigue.