Morisawa S, Hamasaki I, Shibata K, et al. - Via retrospectively examining the records of 64 consecutive patients < 18 years old who had surgery between April 2004 and December 2011, researchers sought to identify significant factors correlated with excessive postoperative exo-drift in young patients with intermittent exotropia who had undergone unilateral lateral rectus muscle recession and medial rectus muscle resection. Findings suggested that younger patients, and those with larger preoperative exo-deviation at distance, lower incidence of peripheral fusion at distance or a greater postoperative initial eso-deviation were significantly more likely to experience excessive postoperative exo-drift (> 20 prism diopters). Univariate analysis showed significant links between excessive postoperative exo-drift and age at surgery, preoperative exo-deviation at distance and postoperative initial eso-deviation at distance. Multivariable linear regression analysis revealed that postoperative initial eso-deviation at distance was significantly related to postoperative exo-drift. The initial postoperative eso-deviation, which can offset the overcorrection, is expected for postoperative exodrift in unilateral RR. However, in cases where there is a large preoperative exo-deviation and/or a younger age, the exo-drift is greater and should be carefully followed.