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

Shang-Min Yeh, Chen-Cheng Lo, Chi-Hung Lee, Yu-Jung Chen, Feng-Chi Lin and Shuan-Yu Huang
Additional contact information
Shang-Min Yeh: Department of Optometry, Chung Shan Medical University, 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
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

IJERPH, 2021, vol. 18, issue 19, 1-9

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.

Keywords: accommodative response; double-mirror system (DMS); accommodative relaxation; myopia control (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.mdpi.com/1660-4601/18/19/9951/pdf (application/pdf)
https://www.mdpi.com/1660-4601/18/19/9951/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jijerp:v:18:y:2021:i:19:p:9951-:d:640404

Access Statistics for this article

IJERPH is currently edited by Ms. Jenna Liu

More articles in IJERPH from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().