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Open AccessArticle

Effects of Horizontal Acceleration on Human Visual Acuity and Stereopsis

Medical Education Center, Kaohsiung Armed Forced General Hospital, Kaohsiung City 802, Taiwan
Department of Pharmacy, Tajen University, Pintung City 907, Taiwan
Institute of Biochemistry and Biotechnology, Chung Shang Medical University and Chung Shang Medical University Hospital, Taichung City 402, Taiwan
Department of Ophthalmology, Taipei Buddhist Tzu Chi General Hospital, Taipei City 231, Taiwan
Department of Ophthalmology, Tri-Service General Hospital, Taipei City 100, Taiwan
Medical Affairs Bureau, Ministry of National Defense, Taipei City 104, Taiwan
Department of Ear-Nose-Throat, Kaohsiung Armed Forced General Hospital, Kaohsiung City 802, Taiwan
Division of Gastroenterology, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei City 100, Taiwan
General Educational Center, Center Taiwan University of Science and Technology, Taichung City 406, Taiwan
Author to whom correspondence should be addressed.
Academic Editor: Paul B. Tchounwou
Int. J. Environ. Res. Public Health 2015, 12(1), 910-926;
Received: 26 November 2014 / Accepted: 13 January 2015 / Published: 19 January 2015
The effect of horizontal acceleration on human visual acuity and stereopsis is demonstrated in this study. Twenty participants (mean age 22.6 years) were enrolled in the experiment. Acceleration from two different directions was performed at the Taiwan High-Speed Rail Laboratory. Gx and Gy (< and >0.1 g) were produced on an accelerating platform where the subjects stood. The visual acuity and stereopsis of the right eye were measured before and during the acceleration. Acceleration <0.1 g in the X- or Y-axis did not affect dynamic vision and stereopsis. Vision decreased (mean from 0.02 logMAR to 0.25 logMAR) and stereopsis declined significantly (mean from 40 s to 60.2 s of arc) when Gx > 0.1 g. Visual acuity worsened (mean from 0.02 logMAR to 0.19 logMAR) and poor stereopsis was noted (mean from 40 s to 50.2 s of arc) when Gy > 0.1 g. The effect of acceleration from the X-axis on the visual system was higher than that from the Y-axis. During acceleration, most subjects complained of ocular strain when reading. To our knowledge, this study is the first to report the exact levels of visual function loss during Gx and Gy. View Full-Text
Keywords: acceleration; Gx; Gy; visual acuity; stereopsis acceleration; Gx; Gy; visual acuity; stereopsis
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Horng, C.-T.; Hsieh, Y.-S.; Tsai, M.-L.; Chang, W.-K.; Yang, T.-H.; Yauan, C.-H.; Wang, C.-H.; Kuo, W.-H.; Wu, Y.-C. Effects of Horizontal Acceleration on Human Visual Acuity and Stereopsis. Int. J. Environ. Res. Public Health 2015, 12, 910-926.

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