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KMID : 1011420190240030267
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Journal of Korean Ophthalmic Optics Society
2019 Volume.24 No. 3 p.267 ~ p.277
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Changes in the Subjective Symptoms and Accommodative Functionafter Near Work in a Virtual Moving Environment
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Kim Ji-Hye
Jung Won-Young
Jeong Min-Jin
Lee Kyeong-Chul
Won Han-Wool
Kim Seong-Do
Park Mi-Jung
Kim So-Ra
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Abstract
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Purpose: The purpose of this study was to investigate changes in the subjective symptoms and accommodative function after watching a movie in a virtual environment moving in the vertical direction.
Methods: Refractive errors of 19 men and 31 women in their 20s were corrected using contact lenses, and the subjects were asked to watch a video on a smartpad with repeated movements in the vertical direction for 30 min. The subjects' accommodative responses were measured every 5 min using an open-field autorefractor while watching a video, and the changing pattern was further analyzed using the subjective symptom scores and accommodative facility before and after watching the movie.
Results: The subjective symptom score of both general and ocular symptoms significantly increased after watching a movie in a virtual moving environment on a smartpad; however, the monocular or binocular accommodative facilities did not significantly change. While watching the video, the accommodative response repeatedly decreased and increased for 30 min in the dominant eye and tended to be maintained after decreasing in the non-dominant eye. In cases of severe ametropia, there was a tendency of repeated decrease and increase in the accommodative response in the non-dominant eye. There was a statistically significant correlation between the binocular accommodative facility and the change in subjective symptoms; however, there was no correlation between the accommodative response and the subjective symptoms.
Conclusions: These results suggest that changes in the subjective symptoms during near work in a virtual environment moving in the vertical direction may not significantly correlate with the accommodative function.
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KEYWORD
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Accommodative facility, Accommodative response, Dynamic environment, Near work, Subjective symptoms, Virtual environment
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