June 2022
Volume 63, Issue 7
Open Access
ARVO Annual Meeting Abstract  |   June 2022
Intensive outdoor activity for 1 week increased choroidal thickness
Author Affiliations & Notes
  • Mamoru Ogawa
    Ophthalmology, Keio Gijuku Daigaku Igakubu Daigakuin Igaku Kenkyuka, Shinjuku-ku, Tokyo, Japan
    Laboratory of Photobiology, Keio Gijuku Daigaku Igakubu Daigakuin Igaku Kenkyuka, Shinjuku-ku, Tokyo, Japan
  • Hidemasa Torii
    Ophthalmology, Keio Gijuku Daigaku Igakubu Daigakuin Igaku Kenkyuka, Shinjuku-ku, Tokyo, Japan
    Laboratory of Photobiology, Keio Gijuku Daigaku Igakubu Daigakuin Igaku Kenkyuka, Shinjuku-ku, Tokyo, Japan
  • Erisa Yotsukura
    Ophthalmology, Keio Gijuku Daigaku Igakubu Daigakuin Igaku Kenkyuka, Shinjuku-ku, Tokyo, Japan
    Laboratory of Photobiology, Keio Gijuku Daigaku Igakubu Daigakuin Igaku Kenkyuka, Shinjuku-ku, Tokyo, Japan
  • Kiwako Mori
    Ophthalmology, Keio Gijuku Daigaku Igakubu Daigakuin Igaku Kenkyuka, Shinjuku-ku, Tokyo, Japan
    Laboratory of Photobiology, Keio Gijuku Daigaku Igakubu Daigakuin Igaku Kenkyuka, Shinjuku-ku, Tokyo, Japan
  • Akiko Hanyuda
    Ophthalmology, Keio Gijuku Daigaku Igakubu Daigakuin Igaku Kenkyuka, Shinjuku-ku, Tokyo, Japan
    Laboratory of Photobiology, Keio Gijuku Daigaku Igakubu Daigakuin Igaku Kenkyuka, Shinjuku-ku, Tokyo, Japan
  • Junko Matsumura
    National Akagi Youth Friendship Center, National Institute For Youth Education, Japan
  • Kohei Fukuoka
    National Akagi Youth Friendship Center, National Institute For Youth Education, Japan
  • Kazuno Negishi
    Ophthalmology, Keio Gijuku Daigaku Igakubu Daigakuin Igaku Kenkyuka, Shinjuku-ku, Tokyo, Japan
  • Toshihide Kurihara
    Ophthalmology, Keio Gijuku Daigaku Igakubu Daigakuin Igaku Kenkyuka, Shinjuku-ku, Tokyo, Japan
    Laboratory of Photobiology, Keio Gijuku Daigaku Igakubu Daigakuin Igaku Kenkyuka, Shinjuku-ku, Tokyo, Japan
  • Kazuo Tsubota
    Ophthalmology, Keio Gijuku Daigaku Igakubu Daigakuin Igaku Kenkyuka, Shinjuku-ku, Tokyo, Japan
    Tsubota Laboratory, Inc., Japan
  • Footnotes
    Commercial Relationships   Mamoru Ogawa None; Hidemasa Torii None; Erisa Yotsukura None; Kiwako Mori None; Akiko Hanyuda None; Junko Matsumura None; Kohei Fukuoka None; Kazuno Negishi None; Toshihide Kurihara None; Kazuo Tsubota Tsubota Laboratory, Inc., Code E (Employment)
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science June 2022, Vol.63, 246 – A0100. doi:
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    • Get Citation

      Mamoru Ogawa, Hidemasa Torii, Erisa Yotsukura, Kiwako Mori, Akiko Hanyuda, Junko Matsumura, Kohei Fukuoka, Kazuno Negishi, Toshihide Kurihara, Kazuo Tsubota; Intensive outdoor activity for 1 week increased choroidal thickness. Invest. Ophthalmol. Vis. Sci. 2022;63(7):246 – A0100.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : The increasing myopia prevalence globally is a relatively recent social health problem. Outdoor activity is an evidence-based environmental factor that protects against myopia progression. The purpose of the current study was to study the positive ocular effects of intensive outdoor activity for only 1 week.

Methods : Children aged 10 to 13 years participated in an intensive outdoor activity program, i.e., more than 2hours on the first day, 3 hours on the second day, and 6 hours daily on subsequent days for a total of 6 days during the 2021 summer vacation at the National Akagi Youth Friendship Center. Eye examinations included measurement of the refractive error using the HOYA iTrace Surgical Workstation (Tracey Technologies) and axial length and corneal thickness using swept-source optical coherence tomography (SS-OCT) biometry (IOLMaster700, Carl Zeiss Meditec AG), choroidal thickness using SS-OCT (Xephilio OCT-S1, Canon), tear fluid volume (Schirmer test and strip meniscometry test), and a questionnaire. These parameters were analyzed at the start and end of the program using the paired-t test. Data from the left eyes were analyzed.

Results : Seventeen children (mean±standard deviation age, 12.0±1.0 years; 47.1% female) were included. The baseline and final choroidal thicknesses were, respectively, 359.5±121.7 and 397.4±122.1 µm (p < 0.001). The respective central corneal thicknesses also differed significantly, i.e., 579.0±45.6 and 584±44.6 µm (p < 0.002). The refractive errors and axial lengths did not differ significantly, -1.69±1.48 diopters (D) vs -1.83±1.87 D (p = 0.201) and 24.15±0.97 mm vs 24.15±0.96 mm (p = 0.463). The tear fluid volume did not differ significantly between the start and end of the program.

Conclusions : Our results suggested that intensive outdoor activity even for 1 week increased the choroidal thickness in Japanese schoolchildren. Further studies are needed to assess the effects in more subjects and thelong term.

This abstract was presented at the 2022 ARVO Annual Meeting, held in Denver, CO, May 1-4, 2022, and virtually.

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