Eye-Tracking And Static Cyclotorsion Compensation (Scc) To Optimize Keratorefractive Lenticle Extraction (Klex) For Astigmatism Correction
Published 2024 - 42nd Congress of the ESCRS
Reference: FP20.05 | Type: Free paper | DOI: 10.82333/ekv0-0231
Authors: Juan Arbelaez* 1 , Maren-Christina Blum 2 , Maria Clara Arbelaez 1 , Samuel Arba-Mosquera 3
1cornea and refractive surgery,Muscat eye laser center,muscat,Oman, 2R&D / Clinical Affairs,Schwind eye-tech-solutions GmbH,Kleinostheim,Germany, 3Senior Optical & Visual Scientist R&D / Biomedical Engineering,Schwind eye-tech-solutions GmbH,Kleinostheim,Germany
Purpose
This retrospective data analysis aims to investigate the impact of eye-tracking and SCC on the astigmatism outcomes for KLEx procedures using an IR-femtosecond laser.
Setting
Observational retrospective review chart in a private practice.
Methods
In this retrospective analysis, we investigated the efficacy of astigmatism correction utilizing the SmartSight method with the SCHWIND ATOS femtosecond laser in 100 eyes from 62 patients (mean age 26±6 years). Our study primarily focused on evaluating the ratio between 3-month postoperative residual astigmatism and preoperative cylinder refraction, assessing axis change, and determining the angle-of-error using the Alpins method as key evaluation parameters. Correlation of these parameters with the determined SCC angle was investigated. In addition, the results between patients with a small SCC angle (<3°) were compared with the results of patients with a large SCC angle (≥7°) using the Mann-Whitney U test (α=0.05).
Results
The preop SEQ of -3.89±1.47D improved 3 month postop to -0.17±0.29D. Postop residual astigmatism of 0.5D or less was achieved in 99% of eyes. Correlation analysis revealed no significant relationship between determined SCC angle and the post to preop cylinder ratio, axis change, or angle-of-error. While comparing small SCC angle to large SCC angle groups, a non-significant trend emerged showing slightly higher cylinder ratios in the large SCC group, particularly among patients with low preop cylinder values (<1D). Additionally, a trend towards higher angle-of-error was observed in the large SCC angle group, again driven by patients with low preop cylinder values. No discernible differences in axis change were noted between the groups
Conclusions
The SmartSight procedure has emerged as a well-accepted and safe method for treating myopic astigmatism, even for high astigmatic corrections (≥3D). Our clinical findings reveal excellent outcomes in astigmatism correction, underscoring the effectiveness of the SCC and eye-tracking functions, particularly in patients with moderate to high preoperative astigmatism.