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Visual discomfort and astigmatic refractive errors in VDT use.

N P Wiggins1, K M Daum

  • 1School of Optometry/The Medical Center, University of Alabama, Birmingham 35294.

Journal of the American Optometric Association
|September 1, 1991
PubMed
Summary
This summary is machine-generated.

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Small amounts of uncorrected astigmatism significantly increase eyestrain for video display terminal (VDT) users. Even minor astigmatic errors negatively impact visual comfort during device use.

Area of Science:

  • Ophthalmology
  • Optometry
  • Human Factors

Background:

  • Astigmatism is a common refractive error affecting visual quality.
  • Video display terminal (VDT) use is prevalent and can induce visual discomfort.

Purpose of the Study:

  • To investigate the impact of small uncorrected astigmatic errors on visual comfort in VDT users.
  • To determine if minimal astigmatism affects visual comfort despite normal visual acuity.

Main Methods:

  • Double-masked, crossover experiment with eight subjects (20/20 corrected visual acuity).
  • Subjects used VDTs for 25-minute periods wearing either test lenses (+0.50 D x 090) or control lenses (+0.12 DS) over their best correction.
  • Visual discomfort was assessed using a questionnaire.

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Main Results:

  • Significantly greater reported eyestrain was found with the test lens pair (p = 0.01).
  • Small astigmatic errors correlated with increased visual discomfort.

Conclusions:

  • Correction of small astigmatic errors is recommended for VDT users to enhance visual comfort.
  • Even minor astigmatism can negatively affect visual well-being during prolonged screen use.