Clinical features and surgical treatment of Vpattern exotropia

Objective To analyze the etiology,clinical characteristics and surgical management for the correction of V pattern exotropia.Methods The case history and surgical effect of 76 V-pattern exotropia in 1340 strabismus were studied.The way of performing surgery depends on clinical manifestation and etiology.Follow-up after surgery was 6-12 months,with mean duration of 9 months.Results The etiology of V pattern exotropia was mainly extraocular museles disfunction (96.05%),including inferior oblique muscle overaction (73.68%),superior oblique muscle underaction (51.32%),superior rectus dysfunction (10.53%),inferior rectus overaction (2.63%),lateral rectus overaction (43.42%),medial rectus disfunction (5.26%).85.53% of surgical treatment acquired the satisfied result,with orthophoria,no V sign.By function training,77.63% of patients got binocular vision.Conclusions The etiology of V pattern exotropia is mainly inferior oblique mus- cle overaction.According to its etiology,different surgical procedure arc chosen,combinating with visual func- tion training,which can acquire binocular vision. Key words: V pattern exotropia; Clinical manifestation; Surgical management