Characteristics of Postoperative Anisocoria After Medial Orbital Wall Fracture Repair.

The purpose of this study was to present the clinical characteristics and etiology of patients with anisocoria after medial wall fracture repair. This study was a retrospective, noncomparative case series of postoperative anisocoria after medial orbital wall fracture repair. Data regarding patient demographics, laterality, signs and symptoms at presentation, interval between injury and surgery, fracture size using orbital computed tomography, pupil size of mydriasis, time of discovery of postoperative mydriasis, time of resolution of anisocoria, surgical outcomes, and complications were collected. Twelve patients were included in this study. The mean interval between injury and surgery was 19.17 ± 4.95 (range, 12-30) days. The mean fracture size of the anteroposterior meridian was 25.22 ± 2.15 (range, 21.8-28.4) mm and that of the horizontal meridian was 16.02 ± 2.02 (range, 12.5-21.2) mm. Postoperatively, unilateral pupil dilation was observed at a mean of 5.33 ± 1.61 (range, 3-8) hours after surgery, and mean pupil size was 5.13 ± 0.61 (range, 4-6) mm in the dilated eye and 3.29 ± 0.26 (range, 3-3.5) mm in the normal eye. The dilated pupils all recovered within a mean of 3.42 ± 1.08 (range, 2-5) days. Postoperative anisocoria after medial orbital wall blowout fracture surgery may occur in delayed repair of the posterior location of large fractures. Transient mydriasis caused by parasympathetic nerve injury returned to normal pupil size.