Effects of Horizontal Acceleration on Human Visual Acuity and Stereopsis

Chi-Ting Horng, Yih-Shou Hsieh, Ming-Ling Tsai, Wei-Kang Chang, Tzu-Hung Yang, Chien-Han Yauan, Chih-Hung Wang, Wu-Hsien Kuo and Yi-Chang Wu
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Chi-Ting Horng: Medical Education Center, Kaohsiung Armed Forced General Hospital, Kaohsiung City 802, Taiwan
Yih-Shou Hsieh: Institute of Biochemistry and Biotechnology, Chung Shang Medical University and Chung Shang Medical University Hospital, Taichung City 402, Taiwan
Ming-Ling Tsai: Department of Ophthalmology, Taipei Buddhist Tzu Chi General Hospital, Taipei City 231, Taiwan
Wei-Kang Chang: Medical Affairs Bureau, Ministry of National Defense, Taipei City 104, Taiwan
Tzu-Hung Yang: Medical Education Center, Kaohsiung Armed Forced General Hospital, Kaohsiung City 802, Taiwan
Chien-Han Yauan: Department of Ear-Nose-Throat, Kaohsiung Armed Forced General Hospital, Kaohsiung City 802, Taiwan
Chih-Hung Wang: Medical Affairs Bureau, Ministry of National Defense, Taipei City 104, Taiwan
Wu-Hsien Kuo: Division of Gastroenterology, Department of Internal Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei City 100, Taiwan
Yi-Chang Wu: Medical Affairs Bureau, Ministry of National Defense, Taipei City 104, Taiwan

IJERPH, 2015, vol. 12, issue 1, 1-17

Abstract: 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.

Keywords: acceleration; Gx; Gy; visual acuity; stereopsis (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2015
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