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KMID : 1011420220270040305
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Journal of Korean Ophthalmic Optics Society
2022 Volume.27 No. 4 p.305 ~ p.311
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Evaluation of the Effectiveness of Full-Correction according tothe Refraction Tests for Astigmatism
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Choi Hyun-Dong
Lee Jun-Sun
Jang Wook
Park Mi-Jung
Kim So-Ra
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Abstract
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Purpose: This study aimed to analyze the effect of differences in prescription according to the test method for astigmatism during refraction on corrected vision.
Methods: Twenty-five subjects in their 10s and 30s with no history of vision correction surgery and/or eye disease were tested for astigmatism using a clock dial chart and cross-cylinder, respectively, for their prescription. After wearing the test lens to which each prescription was applied, the minimum angle of resolution (MAR) of the subjects was measured using the Landolt C-ring chart while changing the contrast and letter size, and the difference according to the prescription was further compared.
Results: The cross-cylinder test tended to have a higher prescription value for spherical correction, while the test using a clock dial chart tended to have a higher prescription value for cylindrical correction. Comparing the MAR according to the change in the contrast and the letter size, it was found that the MAR was statistically and significantly better when corrected using the prescription of the cross-cylinder test than that of the clock dial chart. In addition, regardless of the contrast, it was found that the smaller the size of the letters, the more statistically significant difference in the number of letters read between the two refraction tests. Furthermore, there was a difference in the number of letters read between the two refraction tests, depending on the contrast of letters; however, the difference did not show a consistent correlation.
Conclusions: From the result of this study, it was found that in astigmatism, which mainly involves precision work or far-distance viewing for a long time, precise correction by cross-cylinder test should be performed to improve vision satisfaction.
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KEYWORD
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Astigmatism refraction test, Clock dial chart, Cross-cylinder, Minimum angle of resolution
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