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Related Experiment Videos

Oculomotor function after virtual reality use differentiates symptomatic from asymptomatic individuals.

S E Morse1, B C Jiang

  • 1Medical University of South Carolina, Department of Ophthalmology, Charleston 29425, USA.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|September 25, 1999
PubMed
Summary

Virtual reality (VR) head-mounted display (HMD) use can cause visual symptoms. Symptomatic users showed reduced accommodative response and exophoria, unlike asymptomatic users who adapted to VR-HMD use.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Human-Computer Interaction

Background:

  • Virtual reality (VR) head-mounted displays (HMD) are increasingly used for entertainment and professional applications.
  • Some users report adverse visual symptoms after VR-HMD use, prompting investigation into underlying physiological changes.

Purpose of the Study:

  • To investigate potential differences in oculomotor functions between individuals who experience adverse visual symptoms and those who do not after VR-HMD use.
  • To determine if fundamental oculomotor performance differences exist between symptomatic and asymptomatic VR users.

Main Methods:

  • Oculomotor functions including phorias, fixation disparity, accommodative convergence to accommodation ratio (AC/A), stereopsis, and nearpoint of convergence were measured.
  • Measurements were taken before and after a 20-minute period of biocular VR-HMD use in both symptomatic (n=10) and asymptomatic (n=10) individuals.

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Main Results:

  • A nearpoint exophoric shift was observed in nearly all subjects, while farpoint phoria showed no consistent trend.
  • Symptomatic subjects exhibited a reduced stimulus AC/A ratio post-VR use, suggesting a diminished accommodative response.
  • Asymptomatic subjects demonstrated a correlated change in phorias, indicating adaptation, unlike symptomatic subjects.

Conclusions:

  • Oculomotor changes in symptomatic subjects, such as increased near exophoria and reduced AC/A, align with a compromised accommodative response.
  • Asymptomatic subjects' oculomotor changes suggest adaptation in the tonic vergence and/or accommodation systems.
  • Findings highlight distinct oculomotor responses to VR-HMD use, differentiating symptomatic from asymptomatic individuals.