앉은 자세와 누운 자세에서 외사시각의 변화

The Change of Exodeviation in the Seated and Supine Position

Purpose: To evaluate changes in exodeviation in the seated and supine position during adjustable suture strabismus surgery. Methods: We measured the deviation angle at distances of 6 m, 2 m, and 33 cm in the seated position and at 2 m, and 33 cm in the supine position by the alternate prism cover test in fifty patients with exotropia. Results: The mean deviation angle was 25.41±7.08 PD at 6 m, 25.51±7.08 PD at 2 m and 28.09±7.54 PD at 33 cm in the seated position. The mean deviation angle in the supine position was 24.68±7.40 PD at 2 m, and 27.29±8.09 PD at 33 cm. There was no significant difference in exodeviation at the same measuring distance between the seated and supine positions. A significant difference between the exodeviation at 6 m in the seated position and the exodeviation at 2 m in the supine position did not exist. Conclusions: The distant deviation angle at 6 m in the seated position can be replaced by the deviation angle measured by fixating a target at the ceiling in the supine position during adjustable suture strabismus surgery for exotropia.