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Related Experiment Videos

Objective evaluation of visual fatigue in VDU workers

S Gur1, S Ron, A Heicklen-Klein

  • 1Occupational Health & Rehabilitation Institute, Loewenstein Hospital, Raanana, Israel.

Occupational Medicine (Oxford, England)
|September 1, 1994
PubMed
Summary

Prolonged visual display unit (VDU) work can cause eye strain. This study found that measuring accommodation and convergence objectively assesses visual fatigue in VDU users.

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Area of Science:

  • Ophthalmology
  • Occupational Health
  • Human Factors Engineering

Background:

  • Prolonged work with visual display units (VDUs) is associated with visual fatigue and somatic complaints.
  • Current objective measures for VDU-induced eye discomfort are limited.
  • Accommodation and convergence are key visual functions often linked to VDU work.

Purpose of the Study:

  • To investigate the physiological changes in accommodation and convergence in VDU workers.
  • To determine if these visual functions can serve as objective markers for visual fatigue.
  • To compare visual function changes between VDU users and a control group.

Main Methods:

  • The study involved 16 VDU workers and 13 control participants (aged 24-43).
  • Accommodation and convergence ranges were measured twice: at the start of the week and after four days of work.
  • Measurements were taken before work (start of week) and at the end of the workday.

Main Results:

  • VDU workers exhibited a significant decrease in both accommodation and convergence ranges.
  • A greater reduction in these functions was observed in individuals with initially stronger accommodation or convergence.
  • Control group data was used for comparison, though specific results for controls are not detailed in the abstract.

Conclusions:

  • Accommodation and convergence measurements show potential for objectively evaluating visual fatigue in VDU workers.
  • These findings suggest a physiological basis for subjective complaints of eye discomfort.
  • Further research may validate these measures for routine occupational health screening.

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