THE EFFECT OF HORIZONTAL RECTUS SURGERY ON POSTERIOR CORNEAL CURVATURE

Xülasə

Purpose – to investigate the effect of horizontal rectus muscle surgery for strabismus correction on posterior corneal curvature.

Materials and methods
Posterior corneal parameters of patients who underwent medial or lateral rectus muscle surgery (muscle recession, resection or combination procedures) were analyzed using a Pentacam device (Pentacam Oculus Optikgerate, Wetzlar, Germany). Tests were performed before and 1 month after surgery. The amount of change (Δ) in these parameters was compared between the groups that underwent single muscle and two-muscle surgery.

Results
Fifty eyes of 40 patients were included in the study. The mean age was 17.72±7.84 (5-36) years. The mean best corrected visual acuity (BCVA) was 0.86±0.31 (0.1-1) in Snellen. The mean deviation was 40.80±8.50 (20-50) prism diopter. A single muscle (medial or lateral rectus) recession operation was performed in 24 of the eyes. Two muscle surgeries (combination of recession and resection surgery to the medial and lateral rectus muscles) were performed on 26 eyes. In the whole group, cornea back flat-keratometry (K1b) decreased from -6.03±0.18 (-6.3-(-5.50)) to -6.01±0.20 (-6.40-(- 5.60)) (p=0.115). Cornea back-steep keratometry (K2b) increased from -6.35±0.19 (-6.70-(-5.90)) to -6.41±0.20 (-6.90-(-6.10)) (p=0.037). Cornea backmean keratometry (Kmb) remained constant at -6.19±0.17 (p=0.868). Posterior corneal astigmatism increased from 0.31±0.14 (0.1-0.6) to 0.33±0.16 (0.1-0.6) (p=0.276). ΔK2b was significantly higher in the group that underwent two-muscle surgeries (p=0.049).

Conclusion
Studies in the literature are mostly on the effect of strabismus surgeries on the anterior corneal surface. In our study, the effect of horizontal rectus surgery on the posterior cornea was investigated. In the short term, corneal back- steep keratometry was significantly increased after horizontal rectus surgery. This increase was greater in the group undergoing two-muscle surgery