Clinical significance of medial rectus tendon width in unilateral medial rectus resection for patients with previously recessed lateral rectus muscle for exotropia.

In cases of recurrent exotropia, medial rectus resection after bilateral lateral rectus recession is often considered for reoperations. The surgical amount of medial rectus resection is typically determined according to the standard surgical dose table; however, postoperative variability has been noted in the surgical outcomes. In the current study, medial rectus tendon width (MRTW) was measured intraoperatively, and surgical dose-response was calculated as the ratio between amount of correction and resected medial rectus. The MRTW exhibited a positive correlation with age at time of surgery and surgical dose-response. MRTW could thus merit further study as a potential intraoperative predictor of surgical dose-response when considering medial rectus resection in patients with recurrent exotropia.