Initial postoperative alignment versus long-term outcomes in intermittent exotropia surgery.

Area of Science:

• Ophthalmology
• Pediatric Strabismus Surgery
• Clinical Trial Analysis

Background:

• Childhood intermittent exotropia (IXT) is a common strabismus condition requiring surgical intervention.
• Surgical outcomes for IXT are typically assessed by long-term recurrence rates and binocular vision status.
• The immediate postoperative alignment following IXT surgery may predict long-term success.

Purpose of the Study:

• To determine if immediate postoperative esodeviation after IXT surgery is associated with superior long-term outcomes.
• To analyze the relationship between the degree of 1-week postoperative esodeviation and motor recurrence or problematic esotropia at 8 years.

Main Methods:

• A post hoc analysis of a randomized clinical trial involving 185 children (3 to <11 years) undergoing surgery for IXT.
• Participants were randomized to bilateral lateral rectus recession (BLRc) or unilateral lateral rectus recession with medial rectus resection (R&R).
• One-week postoperative distance deviation was categorized into five levels, and long-term outcomes (motor recurrence, problematic esotropia) were assessed up to 8 years.

Main Results:

• A 1-week postoperative esodeviation >15 prism diopters was associated with a significantly lower cumulative probability of motor recurrence by 8 years (5% vs. 54-57% for exodeviation/orthophoria).
• Esodeviation between 8-15 prism diopters also showed a reduced recurrence rate (28%) compared to orthophoria (57%).
• The lowest composite failure rate (15%) was observed with a 1-week postoperative esodeviation >15 prism diopters, despite a slight increase in problematic esotropia (12%).

Conclusions:

• A 1-week postoperative esodeviation greater than 7 prism diopters is associated with a reduced rate of motor recurrence in childhood intermittent exotropia surgery.
• While beneficial for recurrence rates, higher degrees of immediate postoperative esodeviation may be linked to a small increase in problematic esotropia.
• These findings suggest that optimizing immediate postoperative alignment may be crucial for achieving favorable long-term outcomes in IXT surgery.