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Related Experiment Videos

Fatigue reduces tonic accommodation.

S Hasebe1, E W Graf, C M Schor

  • 1360 Minor Hall, School of Optometry, Vision Science Group, University of California-Berkeley, Berkeley, CA 94720-2020, USA.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|March 23, 2001
PubMed
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Accommodative fatigue significantly reduces tonic accommodation (TA) after sustained visual tasks. This fatigue may explain counter-adaptive responses where TA drops below its baseline level.

Area of Science:

  • Ophthalmology
  • Vision Science
  • Neuroscience

Background:

  • Tonic accommodation (TA) is the baseline ocular accommodative state.
  • Sustained visual tasks can alter TA levels, sometimes leading to counter-adaptive responses where TA decreases below its initial baseline.
  • The role of accommodative fatigue in these changes is not fully understood.

Purpose of the Study:

  • To investigate the contribution of accommodative fatigue to counter-adaptive changes in baseline TA.
  • To determine if fatigue procedures can induce reductions in TA.

Main Methods:

  • Two fatigue procedures were employed: monocular stimulation with alternating lenses and binocular stimulation with alternating prisms.
  • Participants viewed targets at 66 cm or 33 cm.

Related Experiment Videos

  • Tonic accommodation levels were measured before and after the fatigue tasks.

    • Main Results:

    • Both monocular and binocular fatigue tasks significantly reduced tonic accommodation.
    • These findings suggest that accommodative fatigue plays a role in the observed reductions in TA.

    Conclusions:

    • Accommodative fatigue may be responsible for the counter-adaptive decreases in tonic accommodation observed after sustained accommodative or convergence efforts.
    • Fatigue of the accommodative system is a plausible explanation for reduced baseline TA.