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Unilateral surgery for exotropia with convergence weakness
S P Kraft1, A V Levin, R W Enzenauer
1Department of Ophthalmology, Hospital for Sick Children, Toronto, Ontario, Canada.
Summary
Surgical intervention for exotropia (XT) with convergence weakness effectively realigns eye alignment at both distance and near. This approach successfully reduces the difference between near and distance deviations, with a low risk of long-term esodeviation.
Area of Science:
- Ophthalmology
- Strabismus Surgery
Background:
- Exotropia (XT) with convergence weakness presents challenges in managing distance and near visual alignment.
- Significant differences between distance and near deviations require specific surgical considerations.
Purpose of the Study:
- To evaluate the efficacy of unilateral surgery for exotropia with convergence weakness.
- To assess the ability of surgery to eliminate distance and near deviations and reduce near-distance differences.
Main Methods:
- Prospective study of 14 patients with exotropia (XT) and convergence weakness.
- Surgical technique involved lateral rectus recessions and medial rectus strengthenings, with amounts based on near deviation.
- Minimum follow-up of 6 months post-surgery.
Main Results:
- Preoperative mean distance XT was 18.3 delta and near XT was 30.1 delta.
- Postoperative mean distance deviation was 0.1 delta XT and near deviation was 1.8 delta XT.
- Mean reduction in near-distance difference was 10.2 delta, with a postoperative mean difference of 1.7 delta.
Conclusions:
- Unilateral surgery biased to medial rectus strengthening effectively corrects exotropia with convergence weakness.
- This surgical approach successfully reduces near-distance differences and aligns fixation at both distances.
- The procedure demonstrates a low risk of inducing long-term postoperative esodeviations.