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Reduction in Accommodative Response of Schoolchildren by a Double-Mirror System

Author

Listed:
  • Shang-Min Yeh

    (Department of Optometry, Chung Shan Medical University, Taichung 402, Taiwan
    Department of Ophthalmology, Chung Shan Medical University Hospital, Taichung 402, Taiwan)

  • Chen-Cheng Lo

    (Department of Optometry, Chung Shan Medical University, Taichung 402, Taiwan)

  • Chi-Hung Lee

    (Department of Electrical Engineering, Feng Chia University, Taichung 407, Taiwan)

  • Yu-Jung Chen

    (Ph.D. Program of Electrical and Communications Engineering, Feng Chia University, Taichung 407, Taiwan
    Department of Optometry, Da-Yeh University, Changhua 515, Taiwan)

  • Feng-Chi Lin

    (Department of Ophthalmology, Kaohsiung Armed Forced General Hospital, Kaohsiung 802, Taiwan)

  • Shuan-Yu Huang

    (Department of Optometry, Chung Shan Medical University, Taichung 402, Taiwan
    Department of Ophthalmology, Chung Shan Medical University Hospital, Taichung 402, Taiwan)

Abstract

Purpose: This study first proposed the application of a double-mirror system (DMS) to extend viewing distance and investigate the accommodative response of schoolchildren under a DMS. Method: Fifty-seven subjects aged between 7 and 12 years old were recruited in this study, and the experiment was divided into two stages. The first stage consisted of a case history inquiry, a refraction state, and a visual function examination. In the second stage, the subjects gazed at an object at distances of 0.4 m, 2.285 m, and through a DMS, respectively, and their accommodative responses were measured using an open-field autorefractor. Results: There was no significant difference in the schoolchildren’s accommodative response between subjects gazing at an object at 2.285 m (0.14 ± 0.35 D, p > 0.05) and those gazing at it through a DMS (0.20 ± 0.35 D). However, their accommodative response showed a significant difference between subjects gazing at an object at 0.4 m and 2.285 m and those gazing at it at 0.4 m and through a DMS. Conclusion: In this experiment, the results of the children’s accommodative response measured at 2.285 m or through a DMS are very similar. The viewing distance can be extended by a DMS, resulting in accommodative relaxation. This result may have potential applications in myopia control.

Suggested Citation

  • Shang-Min Yeh & Chen-Cheng Lo & Chi-Hung Lee & Yu-Jung Chen & Feng-Chi Lin & Shuan-Yu Huang, 2021. "Reduction in Accommodative Response of Schoolchildren by a Double-Mirror System," IJERPH, MDPI, vol. 18(19), pages 1-9, September.
    • Handle: RePEc:gam:jijerp:v:18:y:2021:i:19:p:9951-:d:640404
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    Cited by:

    1. Shu-Yuan Lin & Hui-Rong Su & Chen-Cheng Lo & Shang-Min Yeh & Chi-Hung Lee & Richard Wu & Fen-Chi Lin & Yen-Wei Chu & Shuan-Yu Huang, 2022. "Effects of Extended Viewing Distance on Accommodative Response and Pupil Size of Myopic Adults by Using a Double-Mirror System," IJERPH, MDPI, vol. 19(5), pages 1-10, March.

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