Laser in situ keratomileusis (LASİK) in patients with superior steepening on corneal topography: Is it safe and predictable?

• Published in: International ophthalmology 2020-09, Vol.40 (9), p.2353-2359
• Main Authors: Kepez Yildiz, Burcin, Kemer Atik, Burcu, Yildirim, Yusuf, Agca, Alper, Yasa, Dilek, Kandemir Besek, Nilay, Aygit, Ebru Demet, Demirok, Ahmet
• Format: Article
• Language: English
• Subjects: Acuity; Complications; Cornea; Eye (anatomy); Eye surgery; Medicine; Medicine & Public Health; Ophthalmology; Original Paper; Refraction; Surgery; Thickness; Topography; Visual acuity; Visual observation
• ISSN: 0165-5701; 1573-2630
• DOI: 10.1007/s10792-020-01420-6

Background Attention is usually given to inferior steepening on corneal topography in the evaluation of a patient’s suitability for LASIK surgery. The aim of this study is to investigate long-term refractive results with superior steepening. Methods Patients who underwent LASIK surgery between 2015 and 2019 in our refractive surgery department were retrospectively reviewed. The patients with a ≥ 1.0 D superior–inferior (S–I) quadrant difference in the tangential map, using a Scheimpflug camera with a Placido disc topographer (Sirius), were included in the study. Preoperative and postoperative best-corrected and uncorrected visual acuity (Snellen), cylindrical refraction values, and spherical equivalent (SE) values were compared. Adverse events were recorded. Results Fifty eyes of 28 patients participated in the study. The mean age of the patients was 27.5 ± 8.0 (19–59). Sixteen patients were female (57.1%), and 12 (42.8%) patients were male. The average follow-up time was 29.8 ± 11.1 months (12–61). Average central corneal thickness was 549.4 ± 26.0 (498–602) μm. Average minimal corneal thickness was 549.1 ± 26.9 (497–598) μm. Preoperative S–I quadrant difference (D) was 1.87 ± 0.7 (1.0–3.99). Posterior elevation (Kvb) was 11.2 ± 1.9 (9–17) μm. The preoperative SE value was − 1.7 ± 2.1 (− 6.25–3.25) and improved to − 0.3 ± 0.44 D (− 1.25–0.75) ( p