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KMID : 1011420160210010077
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Journal of Korean Ophthalmic Optics Society
2016 Volume.21 No. 1 p.77 ~ p.81
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Loss of Corrected Visual Acuity According to Different Meridional Visual Acuity in Astigmatic Eyes
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Jo Na-Young
Kim Sang-Yeob
Moon Byeong-Yeon
Cho Hyun-Gug
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Abstract
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Purpose: This study was performed to investigate the difference of meridional visual acuity and the loss of corrected visual acuity (VA) in order to emphasis the importance of astigmatic correction.
Methods: 64 subjects (122 eyes) aged 22.75±2.36 years participated in this study. After full correction of astigmatic refractive error, VA was measured in which the direction of the slit filter was matched with astigmatic axis and 90o to the astigmatic axis.
Results: 52 eyes showed no difference in VA between the two direction. However 70 eyes had difference VA between them. 14 out of 52 eyes and 24 out of 70 eyes had under 1.0 in monocular VA. The astigmatic degree was higher in the existence of VA difference between the two direction than non-existence. The difference is higher with under 1.0 monocular VA. Monocular VA is closely related to the focal line having better VA in the principal focal line. Glasses replacement period was analyzed as 6~12 months for the preservation of better VA.
Conclusions: The final glasses prescription has to be given with full correction because continued under-correction for astigmatism causes meridional VA difference.
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KEYWORD
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Meridional amblyopia, Astigmatism, Slit filter, Visual acuity, Anterior-posterior focal lines
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