Effects of Visual Optical Stimuli for Accommodation-convergence System on Asthenopia
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Accession number;06A0036427
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| Title;Effects of Visual Optical Stimuli for Accommodation-convergence System on Asthenopia |
| Author;
IWASAKI TSUNETO
(School of Medicine, Univ. Occupational and Environmental Health, JPN)
TAWARA AKIHIKO
(School of Medicine, Univ. Occupational and Environmental Health, JPN)
MIYAKE NOBUYUKI
(Nikon Koatekunorojise Jigyokaihatsubu)
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Journal Title;Journal of Japanese Ophthalmological Society
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Journal Code:Z0666A
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ISSN:0029-0203
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VOL.110;NO.1;PAGE.5-12(2006)
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| Figure&Table&Reference;FIG.6, TBL.3, REF.19 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Purpose: We investigated the effect on eyestrain of optical stimuli that we designed for accommodation and convergence systems. Methods: Eight female students were given optical stimuli for accommodation and convergence systems for 1.5 min immediately after 20 min of a sustained task on a 3-D display. Before and after the trial, their ocular functions were measured and their symptoms were assessed. The optical stimuli were applied by moving targets of scenery images far and near around the far point position of both eyes on a horizonal place, which induced divergence in the direction of the eye position of rest. In a control group, subjects rested with closed eyes for 1.5 min instead of applying the optical stimuli. Results: There were significant changes in the accommodative contraction time (from far to near) and the accommodative relaxation time (from near to far) and the lag of accommodation at near target, from 1.26s to 1.62s and from 1.49s to 1.63s and from 0.5 D to 0.65 D, respectively, and in the symptoms in the control group after the duration of closed-eye rest. In the stimulus group, however, the changes of those functions were smaller than in the control group. Conclusion: From these results, we suggest that our designed optical stimuli for accommodation and convergence systems are effective on asthenopia following accommodative dysfunction. (author abst.) |
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