Change in corneal curvature after strabismus surgery

Session Details

Session Title: Cornea & Miscellaneous
Session Date/Time: Saturday 22/02/2020 | 08:30-11:10
Paper Time: 08:30
Venue: Auditorium des Ministres.

First Author: K.Sathianvichitr THAILAND
Co Author(s): T. Surachatkumtonekul  K. Sathianvichitr  P. Sangsri  M. Saiman        

Abstract Details

Purpose:

To study corneal curvature after strabismus surgery

Setting:

Prospectively non-randomised observational design. 54 patients (85 eyes, median age 10 years) who underwent MR and/or LR recession or resection and/or IO myectomy at Siriraj hospital from February to October 2018 were recruited prospectively and non-randomized. The patients with corneal scar and irregular astigmatism were excluded.

Methods:

The Placido disk-based topography was applied preoperatively and postoperatively at 1 week, 1 month and 3 months by 2 experienced technicians. Most of the operations were LR recession (23 eyes), MR recession (19 eyes) and combined IO surgeries (17 eyes). The conic fitting was analyzed in MATLAB2018a. The asphericity in vertical (Qy) and horizontal (Qx) meridian were calculated. Wilcoxon signed-rank test was used for compared sphericity before and after surgery.

Results:

In LR recession group, Qy was more prolate significantly at 1 and 3 months (P less than 0.001 for both). The similar finding was found in the combined horizontal muscle surgery with IO myectomy at 1 and 3 months (P 0.020 and P 0.009 respectively) and transient change in Qx. Whereas, there was no significant change in the IO myectomy group. In LR recession group, the change in Qy had weak positive correlation with age (rs 0.531, P 0.016 at 3 months) and weak negative with the amount of recession ( rs -0.334, P 0.149 at 3 months)

Conclusions:

LR recession and the the horizontal muscle surgery with IO myectomy caused the vertical meridian of cornea to more prolate (central curvature was steeper relative to peripheral cornea). Its effect still last at 3-month follow up. However, we didn’t find this significant change in MR recession, resection and R&R group. So, We suggest to repeat refraction every patients after recession procedure and the horizontal muscle surgery with IO myectomy.

Financial Disclosure: