Please use this identifier to cite or link to this item:
http://hdl.handle.net/10397/95757
Title: | Bi-directional refractive compensation for with-the-rule and against-the-rule astigmatism in young adults | Authors: | Chan, KH Shik, HT Kwok, KW Kee, CS Leung, TW |
Issue Date: | Sep-2022 | Source: | Investigative ophthalmology and visual science, Sept. 2022, v. 63, no. 10, 15 | Abstract: | Purpose: The purpose of this study was to investigate the short-term effect of imposing astigmatism on the refractive states of young adults. Methods: Nineteen visually healthy low-astigmatic young adults (age = 20.94 ± 0.37 years; spherical-equivalent errors [M] = −1.47 ± 0.23 diopters [D]; cylindrical errors = −0.32 ± 0.05 D) were recruited. They were asked to wear a trial frame with treated and control lenses while watching a video for an hour. In three separate visits, the treated eye was exposed to one of three defocused conditions in random sequence: (1) with-the-rule (WTR) astigmatism = +3.00 DC × 180 degrees; (2) against-the-rule (ATR) astigmatism = +3.00 DC × 90 degrees; and (3) spherical defocus (SPH) = +3.00 DS. The control eye was fully corrected optically. Before and after watching the video, non-cycloplegic autorefraction was performed over the trial lenses. Refractive errors were decomposed into M, J0, and J45 astigmatism. Interocular differences in refractions (treated eye – control eye) were analyzed. Results: After participants watched the video with monocular astigmatic defocus for an hour, the magnitude of the J0 astigmatism was significantly reduced by 0.25 ± 0.10 D in both WTR (from +1.53 ± 0.07 D to +1.28 ± 0.09 D) and 0.39 ± 0.15 D in ATR conditions (from −1.33 ± 0.06 D to −0.94 ± 0.18 D), suggesting an active compensation. In contrast, changes in J0 astigmatism were not significant in the SPH condition. No compensatory changes in J45 astigmatism or M were found under any conditions. Conclusions: Watching a video for an hour with astigmatic defocus induced bidirectional, compensatory changes in astigmatic components, suggesting that refractive components of young adults are moldable to compensate for orientation-specific astigmatic blur over a short period. |
Keywords: | Astigmatism Compensation Adaptation Astigmatic defocus |
Publisher: | Association for Research in Vision and Ophthalmology | Journal: | Investigative ophthalmology and visual science | ISSN: | 0146-0404 | EISSN: | 1552-5783 | DOI: | 10.1167/iovs.63.10.15 | Rights: | Copyright 2022 The Authors This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (https://creativecommons.org/licenses/by-nc-nd/4.0/). The following publication Chan, K. H., Shik, H. T., Kwok, K. W., Kee, C. S., Leung, T. W. (2022). Bi-directional Refractive Compensation for With-the-Rule and Against-the-Rule Astigmatism in Young Adults. Investigative ophthalmology and visual science, 63(10), 63 is available at https://doi.org/10.1167/iovs.63.10.15 |
Appears in Collections: | Journal/Magazine Article |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
i1552-5783-63-10-15_1664001254.2753.pdf | 673.28 kB | Adobe PDF | View/Open |
Page views
68
Last Week
1
1
Last month
Citations as of May 5, 2024
Downloads
37
Citations as of May 5, 2024
SCOPUSTM
Citations
2
Citations as of Apr 19, 2024
WEB OF SCIENCETM
Citations
2
Citations as of May 2, 2024
Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.