Efficacy analysis of inferior oblique muscle belly transposition for small-angle asymmetric superior oblique palsy

[3] In the study by Caldeira,[4] 21% of the patients with mild to moderate IOOA developed A pattern following the surgery. [...]it remains a clinical challenge to select the most appropriate type of surgery for the treatment of small-angle asymmetric SOP. A total of 30 pediatric patients (42 affected eyes) with small-angle asymmetric SOP who underwent IOMBT procedure at Anhui Province Children's Hospital from June 2018 to August 2020 met the inclusion criteria: (1) a diagnosis of asymmetric SOP; (2) concurrent mild to moderate unilateral or bilateral IOOA, graded “+” to “++” according to the scale by Kenneth[6]; (3) severity of vertical deviation in primary position ≤5 prism diopters (PD); and (4) complete follow-up information. The eight patients with concurrent V pattern had their condition significantly improved as well: at 6-month post-operatively, the mean degree of V pattern decreased from 18.0 ± 3.5 PD pre-operatively to 1.6 ± 0.9 PD (P