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.
Highlights
In order to reduce accommodation and slow the progress of myopia, this study proposes a new simple design of a double-mirror system (DMS) to extend viewing distance; while an object is still placed at a near distance, a virtual image is located further in front of the eye, resulting in accommodative relaxation
The accommodative responses were 1.34 ± 0.43 D, 0.36 ± 0.30 D, and 0.37 ± 0.31 D; the accommodative microfluctuations were 1.22 ± 0.26 D, 0.37 ± 0.23 D, and 0.35 ± 0.24 D, which correspond to viewing distances of 0.4 m, 2.285 m, and through a DMS
The values of the accommodative responses and microfluctuations for the nearviewing distance of 0.4 m were larger than 0.97 D and 0.87 D, as well as those through a DMS
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Myopia is one of the most prevalent diseases in the world today. 2.620 billion people may have had myopia in 2020, with a myopia rate of 34.0% in the global population; by 2050, the global myopia population may be as high as 4.758 billion, representing a myopia rate of nearly half of the global population (49.8%) [1,2,3,4,5,6,7]. Myopia may lead to eye-related diseases, such as cataracts, glaucoma, retinal detachment, etc., and these diseases can cause irreversible visual impairment [3]. The rate of myopia has been increasing year by year, which makes it an important global issue that cannot be ignored
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