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Effects of Horizontal Acceleration on Human Visual Acuity and Stereopsis

Author

Listed:
  • Chi-Ting Horng

    (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)

  • 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
    Department of Ophthalmology, Tri-Service General Hospital, Taipei City 100, 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
    General Educational Center, Center Taiwan University of Science and Technology, Taichung City 406, Taiwan)

  • Yi-Chang Wu

    (Medical Affairs Bureau, Ministry of National Defense, Taipei City 104, Taiwan)

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.

Suggested Citation

  • Chi-Ting Horng & Yih-Shou Hsieh & Ming-Ling Tsai & Wei-Kang Chang & Tzu-Hung Yang & Chien-Han Yauan & Chih-Hung Wang & Wu-Hsien Kuo & Yi-Chang Wu, 2015. "Effects of Horizontal Acceleration on Human Visual Acuity and Stereopsis," IJERPH, MDPI, vol. 12(1), pages 1-17, January.
    • Handle: RePEc:gam:jijerp:v:12:y:2015:i:1:p:910-926:d:44856
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