Gunduz, AbuzerFirat, MuratOzsoy, ErcanCankaya, Cem2024-08-042024-08-0420190008-41821715-3360https://doi.org/10.1016/j.jcjo.2018.01.035https://hdl.handle.net/11616/98223Objective: To evaluate the effect of inferior oblique anterior transposition (IOAT) on improvement of vertical hyperdeviation in primary position. Methods: This study was a retrospective review and included 35 eyes of 33 patients (18 males and 15 females). Patients with dissociated vertical deviation were not included in the study. Preoperative and postoperative average follow-up was 11.46 +/- 11.73 and 11.43 +/- 9.73 months, respectively. The eyes were divided into 5 groups according to the amount of transposition. Inferior oblique muscle was transpositioned 2 mm posterior to the inferior rectus insertion in group 1; 1 mm posterior to the inferior rectus insertion in group 2; parallel to the inferior rectus insertion in group 3; 1 mm anterior to the inferior rectus insertion in group 4; and 2 mm anterior to the inferior rectus insertion in group 5. Results: The mean preoperative and postoperative vertical hyperdeviation were 16.52 +/- 5.54 and 0.97 +/- 2.34 prism diopters (PD), respectively. The mean preoperative vertical hyperdeviation in group 1, group 2, group 3, group 4, and group 5 was 11.0 +/- 4.24, 12.88 +/- 4.26, 16.63 +/- 3.50, 19.83 +/- 2.71, and 25.5 +/- 3.00 PD, respectively. Postoperatively, improvement in vertical hyperdeviation in group 1, group 2, group 3, group 4, and group 5 was 11.0 +/- 4.24, 11.63 +/- 3.20, 15.46 +/- 3.19, 18.17 +/- 2.23, and 25.5 +/- 3.00 PD, respectively. The vertical hyperdeviation had improved 100% in group 1; 90.2% in group 2; 92.9% in group 3; 91.59% in group 4; and 100% in group 5. Conclusion: IOAT surgery planned according to hyperdeviation amount has effective and predictable results in correcting vertical hyperdeviation in primary position.eninfo:eu-repo/semantics/closedAccessMuscleArticle54175823085177810.1016/j.jcjo.2018.01.0352-s2.0-85044724095Q2WOS:000460552900029Q3