Abstract

Objective To compare the binocular fusion and stereoacuity achieved in patients before and after successful surgical alignment of intermittent exotropia.Methods Retrospective case series study.Consecutive cases of 114 patients of intermittent exotropia with successful surgical alignment (+5 ～-10PD) in the Eye Center of Provincial Hospital affiliated to Shandong University were retrospectively recruited.Titmus stereogram was used to evaluate the near stereoacuity and Worth 4dots flashlight test was used to evaluate the central and peripheral fusion of the patients before and after successful surgical alignment of intermittent exotropia.Prism and alternative cover test was used to evaluate the deviation of the patients fixating at accommodative targets of 6m and 33cm.Based on the angles examined after surgery,114 patients were divided into 4 groups (Group A:+1～+ 5PD; Group B∶ 0 PD; Group C∶-1～-5PD; Group D∶-6～-10PD).Chi-square test and nonparametric Wilcoxon signed rank test were used to compare the binocular fusion and stereoacuity of patients respectively before and after surgery,P ＜0.05 were considered statistically significant.Results There were significant difference statistically between binocular fusion evaluated before surgery and that after surgery in patients with intermittent exotropia (P =0.000).Binocular fusion evaluated after surgery was significantly different among 4 groups (P =0.004).There was statistical significance between stereoacuity examined before and after surgery (P =0.000).Stereoacuity examined before and after surgery was not significantly different in Group A (P =0.336),others had statistical significance (P =0.001).Conclusions There is significant improvement in binocular fusion and stereoacuity after successful surgical alignment of patients with intermittent exotropia,compared with that before surgery. Key words: Exotropia; Intermittent; Surgery; Fusion; Stereoacuity

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