Abstract
Purpose :
As inferior oblique muscle has an auxillary abductive function, concurrent inferior oblique muscle weakening surgery may have an effect on postoperative course of exotropia. The purpose of this study was to investigate the effects of inferior oblique muscle weakening on resolution of initial overcorrection after exotropia surgery.
Methods :
We retrospectively recruited the patients who undergone bilateral lateral rectus recession surgery for exotropia and showed initial esotropia at 1 week after surgery and followed up for more than 6 months. The patients were divided according to whether IO weakening surgery is combined (group1) or not (group2). Success rate was assessed.
Results :
A total of 39 patients were included in this study.(25 in group1 and 14 in group2) Preoperative characteristics were not different between the two groups except combined vertical strabismus and oblique muscle overaction. Surgical success rates were not different between the two groups at 1 month, 6months postoperatively and final examination. Surgical success was achieved in 18 (72%) patients in group 1 and 7 (50%) in group2. Overcorrected patients were 4 (16%) in group1 and 6 (42.8%) in group2.
Conclusions :
Although there was no significant statistical difference, a numerical difference in the proportion of overcorrected patients in the last follow-up observations suggests that there may be differences in the course of the two groups. Careful consideration should be given to overcorrection in exotropia surgery with IO weakening and further study on a large number of patients should be followed.
This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.