Strabismus surgery for patients with acquired nonaccommodative esotropia based on monocular occlusion test

Area of Science:

• Ophthalmology
• Strabismus Surgery
• Oculomotor Function

Background:

• Acquired nonaccommodative esotropia (ANAET) presents unique surgical challenges.
• Accurate preoperative assessment is crucial for successful strabismus surgery outcomes.
• Determining the appropriate surgical target in ANAET is essential to correct ocular alignment.

Purpose of the Study:

• To evaluate the efficacy of the monocular occlusion test in guiding surgical decisions for acquired nonaccommodative esotropia (ANAET).
• To assess the surgical outcomes in ANAET patients based on preoperative monocular occlusion testing.
• To determine if monocular occlusion testing can predict successful surgical correction of esodeviation.

Main Methods:

• Prospective enrollment of patients diagnosed with ANAET.
• Performance of a monocular occlusion test, measuring the change in esodeviation angle after 1 hour of patching.
• Surgical intervention using bimedial rectus muscle recession based on the measured esotropia post-occlusion.

Main Results:

• 14 out of 32 ANAET patients exhibited a significant increase in esotropia angle after monocular occlusion.
• Post-occlusion esotropia angles averaged 22.3^Δ for distance and 24.6^Δ for near.
• Following surgery, 31 of 32 patients achieved an esodeviation angle of less than 8^Δ, with no reported diplopia or complications.

Conclusions:

• The monocular occlusion test is a valuable tool for preoperative assessment in ANAET.
• Incorporating this test aids in determining the optimal surgical target for improved outcomes.
• This approach leads to successful alignment and a low complication rate in ANAET surgery.