Underacting Inferior Oblique Muscle Following Myectomy or Recession for Unilateral Inferior Oblique Overaction

Abstract

Inferior oblique underaction was common (28 patients, 35.4%), generally mild, persistent, and usually asymptomatic 6 months following surgery. Although uncommon (5 patients, 6.3%), symptomatic inferior oblique underaction required further surgery with a successful outcome. They included 2 patients with a history of head or orbital trauma and one with masked and one with highly asymmetric bilateral inferior oblique overaction.