상사근마비 환자에서 단안 하사근후전술 시행 후 수직사시각의 변화

The Change of Vertical Deviations after Isolated Inferior Oblique Muscle Recession for Superior Oblique Palsy

Purpose: To investigate the amount of vertical deviation correction after isolated inferior oblique muscle 10 mm recession. Methods: From February 2002 to may 2016, 26 patients with unilateral superior oblique palsy were retrospectively investigated using the medical records. The patients who had undergone strabismus surgery before the visit were excluded from the study group. The follow-up period was 1 year after surgery. Patients who had a preoperative deviation of more than 15 prism and those who were within 15 prism were compared. Also, patients were divided according to the degree of inferior oblique muscle overaction. Results: The paralyzed eyes were 15 in the right eye, 11 in the left eye, and 10 with intermittent exotropia. All of 14 patients less than 15 prism diopters before surgery were corrected to less than 4 prism diopters. Also, all of 12 patients greater than 15 prism diopters were corrected to less than 8 prism diopters within 1 month after surgery. There was no statistically significant difference between the two groups in the postoperative correction rate according to the degree of inferior oblique muscle overaction. Conclusions: Regardless of the amount of vertical deviations and the amount of inferior oblique muscle overaction, we suggest isolated inferior oblique muscle 10mm recession to the patients with superior oblique palsy with a vertical deviation.