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Comparison of Binocular Function in Normal Subjects and Convergence Insufficiency  

Shim, Hyun-Seog (Department of Ophthalmic Optics, Gwangju Health College University)
Shim, Moon-Sik (Department of Ophthalmic Optics, Gwangju Health College University)
Kim, Sang-Hyun (Department of Ophthalmic Optics, Gwangju Health College University)
Publication Information
Journal of Korean Ophthalmic Optics Society / v.15, no.3, 2010 , pp. 287-291 More about this Journal
Abstract
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 $age{\pm}SD=23.27{\pm}2.85$ 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. r. Results: The values between normal subjects and convergence insufficiency were 5.71 cm and 7.07 cm for NPC, 5.28 and 2.81 for Heterophria AC/A, 0.92 exo/3.36 exo and 2.17 exo/10.84 exo 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.
Keywords
Normal subjects; Convergence insufficiency; Binocular function;
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