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Related Experiment Videos

Change in visual function and viewing distance during work with VDTs.

I Gratton1, B Piccoli, A Zaniboni

  • 1Department of Ophthalmology, Istituti Clinici di Perfezionamento, Milan, Italy.

Ergonomics
|December 1, 1990
PubMed
Summary
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Computer use significantly impacts vision, causing increased accommodation and decreased fusional convergence in bank clerks. Prolonged screen time may lead to visual fatigue and changes in eye function.

Area of Science:

  • Ophthalmology
  • Optometry
  • Occupational Health

Background:

  • Prolonged computer use is common in office environments.
  • Potential visual strain and changes in ocular function are associated with extended screen time.

Purpose of the Study:

  • To investigate the effects of a 6-hour computer workstation session on visual parameters.
  • To assess changes in accommodation, refraction, and vergence in bank clerks.

Main Methods:

  • Laboratory trial involving seven female bank clerks (24-32 years old).
  • Ocular examination, including refraction and phorias, before and after a 6-hour workday.
  • Measurement of near and far point refraction, and near point fusional vergences.
  • Monitoring of eye screen distance (viewing distance).

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Main Results:

  • Statistically significant changes observed in accommodation and vergence.
  • Increased accommodation in 13 out of 14 eyes and decreased fusional convergence in six out of seven subjects.
  • A decrease in divergence was noted in all participants.
  • Viewing distance showed an increase during the latter part of the trial.

Conclusions:

  • A 6-hour workday at a PC workstation can induce significant changes in ocular accommodation and vergence.
  • These findings suggest potential for visual fatigue and functional adaptation due to prolonged computer use.
  • Further research is warranted to explore long-term implications and preventive strategies.