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KMID : 1011420210260010053
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Journal of Korean Ophthalmic Optics Society
2021 Volume.26 No. 1 p.53 ~ p.64
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The Effect of Astigmatic Blur on Contrast Sensitivity among Groups of Natural Astigmatism Power
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Jeong Hyung-Ryul
Jung Su-A
Lee Jeong-Lim
Kim Hyun-Jung
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Abstract
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Purpose: This study investigates the effect of the astigmatic blur of the same amount on contrast sensitivity among groups of natural astigmatism power.
Methods: A total of 34 adults (average age of 22.11±2.32 years) with myopic with-the-rule astigmatism were selected. The natural astigmatism power was subdivided into four groups (Group I: ?0.50≤DC
Results: Spherical equivalent correction and undercorrected cylindrical diopters decreased the contrast sensitivity at all spatial frequencies, with a statistically more significant decrease at high spatial frequencies (12 and 18 cpd) than at low spatial frequencies (1.5, 3, 6 cpd). In addition, when the spatial frequency was the same, in terms of contrast sensitivity, there was no statistically significant difference in natural astigmatism power in the undercorrected cylindrical diopter of the same amount. However, there was a greater statistically significantly decrease in Group III and IV than in Group I and II in the spherical equivalent correction.
Conclusions: The astigmatic blur with spherical equivalent correction and undercorrected cylindrical diopter causes a decrease in contrast sensitivity. Specifically, when the natural astigmatism power is over ?2.00 D, the spherical equivalent correction causes a greater decrease in contrast sensitivity. Therefore, we estimate that undercorrected cylindrical diopter of under ?1.00 D is necessary, instead of spherical equivalent correction at over ?2.00 D.
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KEYWORD
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Astigmatism, Natural astigmatism power, Astigmatic blur, Undercorrected cylindrical diopter, Contrast sensitivity
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