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A. Azimi Khorasani, H. Momeni Moghaddam, H. Ansari, M. Salehi Fadardi, M. Ehsani; Relationship Between Convergence System and Binocular Visual Symptoms. Invest. Ophthalmol. Vis. Sci. 2009;50(13):2490.
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© ARVO (1962-2015); The Authors (2016-present)
Evaluation of convergence system and prevalence of different types of exophoria and its relationship with binocular visual symptoms among students of para medical faculty of Zahedan medical university in 2009.
81 students were selected randomly, and divided in to symptomatic and asymptomatic groups. Refractive errors corrected if necessary. The near and far exophoria measured by prism and alternative cover test. Near point of convergence (NPC) and stereoacuity were evaluated. Convergence insufficiency(CI), divergence excess (DE)and basic condition was determined according to the difference between far and near exophoria amounts.
30.9% were symptomatic and 69.1% were asymptomatic.The mean of near exophoria for all persons, symptomatic and asymptomatic group were 5.13, 11.24 and 2.41 prism diopter, respectively. These amounts were 0.88, 2.12 and 0.33 prism diopter foe far exophoria.The mean of near point of convergence in the all subjects, symptomatic and asymptomatic group were: 10.95, 15.25 and 9.05 cm, respectively. The prevalence of abnormal patterns of jump convergence in all , symptomatic and asymptomatic groups were 23.45, 31.57 and 68.42 percent, respectively.The mean of streoacuity in all, symptomatics and asymptomatics were 60.18, 87 and 48.27 sec of arc.Statistical considerable relation between near exophoria and having symptom was found (p<0.001). Having symptoms was related to NPC amount (p<0.001) and jumping convergence ( p=0.01). Relationship between symptoms and far exophoria (p=0.02) werenot different statistically. The prevalence of Basic amount, CI, and DE conditions in males were 36.86, 57.89, 5.26% and in females were 37.09, 61.29, 1.61%.
According to this study the prevalence of basic exophoria was higher than other types. The relationship between near exophoria and symptoms was considerable but for far exophoria was not. NPC and jumping convergence and near exophoria are good indicators for assessment of convergence system.
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