Clinical Ophthalmology (Jun 2022)
Visual and Topographic Outcomes of Corneal Collagen Cross Linking for Post LASIK Ectasia
Abstract
Mohamed H Nasef, Sharif Y El Emam, Tamer I Haleem, Wesam S Shalaby, Waleed A Allam Ophthalmology Department, Faculty of Medicine, Tanta University, Tanta, Gharbia, EgyptCorrespondence: Mohamed H Nasef, Tanta University Ophthalmology Hospital, Tanta University Medical Campus, Al-Geish St, Tanta, Gharbia, 31527, Egypt, Tel +20 10 02826555, Email [email protected]: To assess the topographic and visual outcomes of corneal cross-linking (CXL) for post-LASIK ectasia.Methods: A retrospective case series of patients who had progressive post-LASIK ectasia, with at least 2 years of follow-up. They had epithelium-off CXL. Topographical and visual changes were recorded.Results: The study included 21 eyes of 11 patients. At month 24, the final logMAR corrected distance visual acuity (CDVA) and spherical equivalent (SE) were stable compared to baseline (0.16, and − 2.0 diopter (D), respectively). The final Kmean and Kmax were 42.5 and 47.4 D, respectively. Stability or improvement in CDVA, SE, and Kmax was seen in 17 eyes (81%). Significant corneal thinning was seen (438 vs 457 microns, p = 0.003). Thinning by 2% or more was seen in 12 eyes (57.1%). Failure of CXL was seen in 4 eyes (19%). No other ocular complications were seen.Conclusion: CXL for post LASIK ectasia is a safe and effective modality. Despite corneal thinning, there was stability or improvement in topographic parameters and CDVA over the 2-year follow-up period.Keywords: corneal collagen cross linking, corneal ectasia, LASIK, refractive surgery
