Abstract
Purpose :
To investigate the amount of vertical deviation correction after isolated inferior oblique muscle recession and to investigate the meaning of successful operation in patients with superior oblique palsy.
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. Diagnosis was made in the case of monocular oblique muscle abnormality following prism test, a case of increased superiority in the direction of non-paralized eye, and a case of positive reaction of bielschowsky head tilt test. Surgery is considered as ‘success’ when remaining vertical deviation is less than 8 prism diopters.
Results :
The paralyzed eyes were 15 in the right eye, 11 in the left eye, and 10 with intermittent exotropia. Of 14 eyes less than 15 prism diopters before surgery, 14 eyes were corrected to less than 8 prism diopters. Twelve eyes of 12 eyes greater than 15 prism diopters were corrected to less than 8 prism diopters within 1 month after surgery. Successful postoperative correction was achieved. There was no statistically significant difference between the two groups in terms of preoperative vertical deviations and inferior oblique muscle overaction and 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 that patients with superior oblique palsy with a vertical deviation of less than 25 prism diopters should observe the results after undergoing isolated inferior oblique muscle recession.
This is an abstract that was submitted for the 2018 ARVO Annual Meeting, held in Honolulu, Hawaii, April 29 - May 3, 2018.