Advancement of medial rectus muscle to the original insertion for consecutive exotropia

Twenty-four patients who underwent surgery to correct consecutive exotropia that developed iatrogenically after surgical overcorrection were studied retrospectively. All patients underwent single or bilateral advancement of the medial rectus muscle to the original muscle insertion. The mean preoperative exodeviation was 26.7 prism diopters at distance and 35.2 delta at near. Postoperatively, in cases receiving advancement of a single medial rectus, the mean amount of correction was 23.2 delta at distance and 29.6 delta at near. In cases receiving bilateral medial rectus advancement, the mean amount of postoperative correction was 26.3 delta at distance and 39.8 delta at near. Adduction deficiency was normalized in five patients (71%), while convergence insufficiency was improved in only nine patients (45%) after surgery. Twelve (50%) patients had binocular single vision at distance on a normal or abnormal basis as determined by the Bagolini lens test.