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KMID : 1011420160210020119
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Journal of Korean Ophthalmic Optics Society
2016 Volume.21 No. 2 p.119 ~ p.126
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Effect of Accommodation Control by Applying Fogging Method in Subjective Refraction and Auto-Refraction in Ametropia
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Lee Kang-Cheon
Kim Sang-Yeob
Cho Hyun-Gug
Yu Dong-Sik
Moon Byeong-Yeon
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Abstract
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Purpose: To analyze the effect of accommodative control and change values between subjective refraction (SR) and auto-refraction (AR) according to application of fogging after accommodative stimulation depending on ametropia type.
Methods: Myopic ametropia 76 eyes and hyperopic ametropia 52 eyes participated for this study. SR and AR values measured by three test conditions (Before accommodative stimulation; Before AS, After accommodative stimulation; After AS, and After application of fogging; After AF) were compared, respectively.
Results: In myopic eyes, (?) spherical power by SR and AR in After AS test was significantly increased as compared to Before AS test, (?)spherical power in After AF test was decreased to the level of Before AS test. The differences of spherical power between SR and AR were highly measured by SR in After AS test, and highly measured by AR in After AF test, respectively. In hyperopic eyes, (+)spherical power of SR significantly decreased in After AS test compared to Before AS test, more (+)spherical power was detected in After AF test compared to Before AS test. (+)spherical power of AR have no significant difference between Before AS and After AS test, but more (+)spherical power was detected in After AF test compared to Before AS test. The differences of (+)spherical power between SR and AR were significant in all test conditions. Among 52 eyes which were measured as hyperopic ametropia, 7 eyes were measured as myopia by SR in After AS test. In case of AR, 25 eyes among 52 eyes were mismeasured as myopia of ranges from ?0.25 D to ?1.25 D in Before AS test, 26 eyes in After AS test, and 19 eyes in After AF test were mismeasured as myopia of ranges from ?0.25 D to ?1.25 D.
Conclusions: Regardless of ametropia type, accommodative control by After AF test was effective on both refraction process. However, in auto-refraction for hyperopic eyes, the misdetermined proportion of refractive error's type was high due to consistent accommodative intervention in all test condition. Therefore, in order to obtain an accurate value of refractive errors, full correction should be determined by subjective refraction process after fogging method.
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KEYWORD
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Accommodative control, Fogging, Subjective refraction, Auto-refraction, Hyperopic ametropia, Myopic ametropia
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