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Analysis of astigmatism outcomes after horizontal rectus muscle surgery in patients with intermittent exotropia

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Author(s)
Dong Cheol LeeSe Youp Lee
Keimyung Author(s)
Lee, Se Yup
Department
Dept. of Ophthalmology (안과학)
Journal Title
PLoS One
Issued Date
2020
Volume
15
Issue
10
Abstract
This study examined the factors affecting corneal curvature change after lateral rectus recession and medial rectus resection surgery in patients with intermittent exotropia. This was a retrospective cross-sectional study in intermittent exotropia patients who underwent rectus resection surgery. The study involved 41 male and 42 female patients (mean age: 9.55 ± 5.03 years, range: 3-28 years). Corneal astigmatism analysis was performed using the Galilei G4 Dual Scheimpflug Analyzer. The values of simulated and ray tracing corneal keratometry (K) of astigmatism, including axis changes, were determined preoperatively and at 1 week and 3 months postoperatively. The factors found to affect corneal curvature change were sex, extent of surgery, and axial length. Simulated and ray tracing changes were significant preoperatively and at 1 week and 3 months after rectus resection surgery (p < 0.05); however, there were no differences in astigmatism (D) at any time. The spherical equivalent had a myopic change after rectus resection surgery with cycloplegic refraction, and in ray tracing mode, flat K was decreased at 1 week from baseline and increased 3 months later. Steep, mean K, and axis increased continuously from baseline to 1 week and 3 months. Astigmatism, in contrast, was increased at 1 week, but decreased at 3 months, with no return to baseline. Univariable linear regression analyses showed that the extent of surgery had an effect on flat K change and that sex had an effect on steep K and axis. Additionally, axial length affected steep K and astigmatism, while age had no effect on any variable. Ray tracing values were significantly different from simulated values. In ray tracing mode, rectus resection surgery may result in astigmatism shifted toward with-the-rule, and myopic changes may be caused by differences in thickness and flexibility of the sclera. Notably, age did not affect any variable.
Keimyung Author(s)(Kor)
이세엽
Publisher
School of Medicine (의과대학)
Citation
Dong Cheol Lee and Se Youp Lee. (2020). Analysis of astigmatism outcomes after horizontal rectus muscle surgery in patients with intermittent exotropia. PLoS One, 15(10), e0240026. doi: 10.1371/journal.pone.0240026
Type
Article
ISSN
1932-6203
Source
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0240026
DOI
10.1371/journal.pone.0240026
URI
https://kumel.medlib.dsmc.or.kr/handle/2015.oak/43274
Appears in Collections:
1. School of Medicine (의과대학) > Dept. of Ophthalmology (안과학)
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