Background To analyze the surgical outcomes for patients diagnosed with acquired nonaccommodative esotropia (ANAET). Methods In this retrospective study, the medical records of 35 patients who had undergone the surgery for ANAET with a postoperative follow-up period of 6?months or more were reviewed. The main outcome measures were postoperative esodeviation angle, final success rate, and factors affecting surgical outcome. Surgical success was considered to be an alignment within 8 prism diopters (PD) at distance and near. Results The preoperative mean esodeviation angles were 37.3?±?13.7 PD at distance and 38.6?±?16.6 PD at near. The postoperative mean esodeviation angles at distance were as follows: 4.2 PD at day 1, 4.0 PD at month 1, 3.9 PD at month 3, 4.9 PD at month 6, 4.7 PD at year 1, and 4.8 PD at final follow-up. There was no statistically significant difference in angle of esodeviation between the initial postoperative period (day 1 to month 6) and the final follow-up day ( p >?0.05). The surgical success rate at final follow-up was 65.7% (23/35). Among the 12 patients for whom the surgery failed, 9 (24.3%) showed esotropia and 3 (8.1%) exotropia of more than 8 PD. Six patients (16.2%) underwent reoperation (4 for esotropia and 2 for exotropia). There was no factor influencing surgical outcome ( p >?0.05). Conclusions The surgical outcome in patients with ANAET was relatively favorable: the final success rate was 65.7% and the reoperation rate was 17.1%.
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