LASIK-induced Corneal Changes after Correction of Hyperopia with and without Application of Mitomycin-C

Abstract

Background The study aimed to assess the role of intraoperative mitomycin-C (MMC) application during hyperopic LASIK correction (+1.00 D to +6.00 D) by examining topographic corneal changes and incidence of regression over a one-year follow-up period. Methods This comparative randomized control study included 136 eyes of 68 hyperopic patients divided into two groups; Group A included 68 eyes of 34 patients that had LASIK with the application of 0.02% MMC for 10 seconds on the stromal bed after excimer laser treatment, and group B included 68 eyes of 34 patients that had LASIK without MMC application. Uncorrected distance visual acuity (UDVA), refraction, keratometry and topography were recorded at 1st week and 1st, 3rd, 6th, and 12th months postoperation. Predictability and treatment efficacy were also recorded at the end of the follow-up period. Results Better predictability was noted in group A than in group B at the 6 month and 12 month follow-up visits, with a mean cycloplegic refraction SE of +0.5 ± 0.31 D in group A and +0.67 ± 0.39 D in group B at the 6 month visit, and +0.63 ± 0.37 D in group A and +0.89 ± 0.48 D in group B at the 12 month visit. The efficacy of the treatment at the end of the follow up period was better in group A than in group B. Group A showed fewer topographic corneal changes than group B. Conclusions Intraoperative MMC application during hyperopic LASIK achieves better predictability and efficacy and induces fewer topographic changes and lower regression rate of hyperopia during the first postoperative year. Trial registration: the Pan African Clinical Trial Registry PACTR201901543722087, on 29 January 2019.

Twelve-month outcomes of single-step transepithelial photorefractive keratectomy for moderate hyperopia and hyperopic astigmatism

“…Topographic stability over one-year follow-up was documented in our study similar to Moawad et al [41] who reported fewer topographic changes after mitomycin C assisted hyperopic LASIK. Gauthier-Fournet et al [42] evaluated the effect of postoperative keratometry on the safety of LASIK for high hyperopia up to 9.5 D and found that corneas with steeper postoperative keratometries were associated with higher loss of CDVA.…”