Journal of Surgery (ISSN: 2575-9760)

research article

Contrast Sensitivity and Corneal Aberrations Analysis in Relation with Epithelial Thickness Changes at the Corneal Apex after Refractive Surgery

Themistoklis K. Gialelis1*, Vassilios P. Kozobolis2,3, Haris Sideroudi2,3, Dimitra M. Portaliou4, Aikaterini E. Mouzaka1, Panagiotis Stavrakas5, Dimitrios Mikropoulos6 and Miguel Teus7

*Corresponding Author: Themistoklis K. Gialelis, Department of Biomedical Sciences, Sector of Optics and Optometry, University of West Attica, Egaleo Park, Ag.Spyridonos str, postal code 12243,Athens, Greece.

Received Date: 01 October, 2021

Accepted Date: 18 October, 2021

Published Date: 21 October, 2021

Abstract

Purpose: To report the changes in Contrast Sensitivity (C.S) and corneal aberrations (HOAS and LOAS) in relation with the Epithelial Thickness (ET) changes at the corneal apex (ET peak) after PRK and LASIK.

Materials and Methods: 58 eyes underwent LASIK and 60 PRK. Corrected Distance Vision Acuity (CDVA), Weber Contrast (SC WEBER), logarithm of CS (CS LOGS), ET peak, LOAs and HOAs were measured before and after refractive surgery. Moreover, the correlation was studied among changes of all parameters. Mean follow up was 12.18 +/- 1.48.

Results: Statistically significant differences were found between preoperative and postoperative values in C.S, E.T and Higher Order Aberrations (HOAs) in both refractive surgery methods. In the PRK group, the mean increment of ET peak was 6.62±1.31 microns and it appeared to be associated with change in C.S and changes in aberrations, LOAs (Ζ00, Ζ02, Ζ11) and HOAs (Ζ31 and Ζ42). However, the change in the epithelium did not seem to affect the CDVA. In the LASIK group, the mean increment of E.T peak was 6.55±1.26 microns but there was not found any association with C.S reduction, changes in HOAs and CDVA. However, there was a correlation with the ET increment and the LOAs (Ζ00, Ζ02, Ζ11).

Conclusions: Although PRK and LASIK found to have similar ET postoperative increment, in PRK these changes seemed to strongly correlate with CS contrary to LASIK. This is probably due to differences in the ablation sublayer and healing process between two techniques.

Keywords: Contrast sensitivity; High order aberrations; Low order aberrations; PRK-LASIK


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