Comparison of Distance and Near Stereoacuity in Normal and Intermittent Exotropic Children

ABSTRACT

PURPOSE: The purpose of this study was to evaluate, and compare the mean value of near and distance stereoacuity in normal and intermittent exotropia {(X)T}children. METHODS: This study included 86 children, 43 normal children and 43(X)T children ranging in age from 4 to 10 years. Near stereoacuity was assessed by Titmus circle and Randot circle tests. Distance stereoacuity was measured with the Random Dot and Circles tests on the Mentor B-VAT II videoacuity tester. The presence of fusion was examined by Worth 4-dot test(W4D). RESULTS: The mean value of near stereoacuity measured on Titmus and Randot was 45.6 and 29.1 seconds of arc(") respectively, in normal children, and 53.5 and 33.5" respectively, in(X)T children. The mean value of distance stereoacuity measured on the Binocular vision random dot E(BVRDE) and Binocular vision circle(BVC) was 131.3 and 46.1" respectively, in normal children, and 265.1 and 161.4" respectively, in(X)T children. There were significant differences in distance stereoacuity between normal and(X)T children(p0.05). In(X)T children, the mean value of stereoacuity for BVRDE and BVC was 155.7 and 70.4" in patients with fusion and 317.9" and 205.3" in those without. There were significant differences in distance stereoacuity for BVRDE and BVC between(X)T children with fusion and without fusion by W4D test(p<0.05). CONCLUSIONS: The result of this study aid in the evaluation of normative distance stereoacuity data in normal children and in the evaluation of control of the deviation and sensory function status by distance stereoacuity measurement in(X)T children aged 4-10 years.