Underacting inferior oblique muscle following myectomy or recession for unilateral XXXX .

@entity1 @entity542 @entity75 @entity2182
PURPOSE: To assess the incidence and investigate the functional impact of postoperative overcorrection following primary unilateral inferior oblique muscle recession and myectomy for @entity2182 . METHODS: A retrospective study of 79 consecutive @entity1 undergoing inferior oblique myectomy (43) or recession (36) with a minimum 6 months of postoperative follow-up. All underwent ocular motility examinations preoperatively and postoperatively at approximately 2 weeks and 6 months. The vertical deviation in primary position and on contralateral gaze and inferior oblique versions and ductions on contralateral elevation were analyzed. RESULTS: At 6 months, 51 @entity1 had no @entity75 (group 1), 23 of 28 who had developed @entity75 were asymptomatic (group 2), and the remaining 5 were symptomatic (group 3). The mean preoperative hyperdeviation was 12.9 (group 1), 13.1 (group 2), and 15 (group 3) prism diopters (PD) in primary position. Postoperatively, these measured 3.8 (group 1), 3.8 (group 2), and -7.8 (group 3) PD (- indicates deviation reversal). The mean preoperative and postoperative inferior oblique versions for these three groups were +2.7, +2.2, +2.2 units and +0.9, -1.0, -1.4 units, respectively. CONCLUSION: @entity75 was common (28 @entity1 , 35.4%), generally mild, persistent, and usually asymptomatic 6 months following surgery. Although uncommon (5 @entity1 , 6.3%), symptomatic @entity75 required further surgery with a successful outcome. They included 2 @entity1 with a history of @entity542 and one with masked and one with highly asymmetric bilateral @entity2182 .
