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KMID : 1011420100150030287
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Journal of Korean Ophthalmic Optics Society
2010 Volume.15 No. 3 p.287 ~ p.291
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Comparison of Binocular Function in Normal Subjects and Convergence Insufficiency
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Shim Hyun-Suk
Shim Moon-Sik
Kim Sang-Hyun
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Abstract
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Purpose: The aim of this study was to compare binocular functions such as near point of convergence (NPC), AC/A ratios, heterophoria, accommodation, accommodation lag, positive relative accommodation (PRA), negative relative accommodation (NRA), positive relative convergence (PRC), negative relative convergence (NRC) in normal subjects and convergence insufficiency.
Methods: 86 subject (male n=45, female n=41, mean age?SD= 23.27?2.85 years) without amblyopia, strabismus, and ocular pathology were studied. Forty three patients each group were classified as normal subjects and convergence insufficiency group based on AC/A ratio and far and near phoria. Binocular function of the two groups was measured using phoropter.
Results: The values between normal subjects and convergence insufficiency were 5.71cm and 7.07cm for NPC, 5.28 and 2.81 for Heterophria AC/A, 0.92exo/3.36exo and 2.17exo/10.84exo for far and near phoria, 15.49/23.30/13.30 and 13.50/20.02/9.09 for PRC, respectively. However, there were no significant differences between normal subjects and convergence insufficiency for accommodative amplitude, accommodative lag, PRA, NRA, BI vergence test, BO vergence test, NRC.
Conclusions: Both groups were a significant difference for cover test, NPC, Heterophria AC/A, far and near phoria, break point of PRC, and recovery point of PRC.
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KEYWORD
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Normal subjects, Convergence insufficiency, Binocular function
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