Predictors of Success Following Muller’s Muscle-Conjunctival Resection

Purpose: This study aims to describe Muller's muscle-conjunctival resection surgery in terms of outcomes and potential factors that may predict final positions. Methods: This cross-sectional cohort study included patients undergoing Muller's muscle-conjunctival resection surgery for involutional ptosis over a 15-year period. Success was defined in 2 ways: 1) final marginal reflex distance 1 (MRD1) ≥2.5 mm (MRD1 success) and 2) final difference in MRD1 ≤1 mm between eyelids (symmetry success). Percentages of patients achieving both outcomes were calculated. Predictors of outcome were assessed using bivariate analysis and multivariate models. Results: The final sample included 315 eyes in 192 patients. The mean age (standard deviation) was 67.9 (11.9) years, and 60.0% were female. MRD1 ≥2.5 mm was achieved in 65.7% of the sample. Symmetry within 1 mm was achieved in 82.9% of the sample. Significant (p