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Related Experiment Video

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Trabecular Meshwork Response to Pressure Elevation in the Living Human Eye
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Driving time modulates accommodative response and intraocular pressure.

Jesús Vera1, Carolina Diaz-Piedra2, Raimundo Jiménez3

  • 1Department of Optics, Faculty of Science, University of Granada, Granada, Spain; Department of Physical Education and Sport, Faculty of Sport Science, University of Granada, Granada, Spain.

Physiology & Behavior
|May 29, 2016
PubMed
Summary

Prolonged driving decreases intraocular pressure (IOP) and accommodative response (AR), indicating visual fatigue. These objective measures correlate with subjective reports of increased fatigue and decreased arousal in drivers.

Keywords:
FatigueNeuroergonomicsOcular biomarkersRoad safetySleepinessTime-on-task

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Area of Science:

  • Ophthalmology
  • Human Factors
  • Transportation Safety

Background:

  • Driving heavily relies on the visual system, involving constant focus adjustments.
  • Prolonged visual tasks, such as driving, are expected to induce visual fatigue.

Purpose of the Study:

  • To investigate the effects of driving time on accommodative response (AR) and intraocular pressure (IOP).
  • To explore objective markers of visual fatigue in drivers.

Main Methods:

  • A pre/post-test design was employed with 12 healthy drivers in a 2-hour virtual driving session.
  • Accommodative response (AR) and intraocular pressure (IOP) were measured before and after driving.
  • Subjective measures of arousal and fatigue were also collected.

Main Results:

  • Intraocular pressure (IOP) and accommodative response (AR) significantly decreased after the driving session (p=0.03 and p<0.001).
  • Accommodative lag increased, particularly at near distances (20-33cm).
  • Subjective arousal decreased, and fatigue increased significantly (all p-values<0.001).

Conclusions:

  • Driving for 2 hours induces measurable changes in ocular parameters, suggesting visual fatigue.
  • Decreased AR and IOP, alongside increased accommodative lag, serve as objective indicators of driver fatigue.
  • These findings support the use of visual fatigue signs for assessing driving impairment.