Effect of Methods of Laser Vision Correction in Patients With Myopia on the Efficiency of Surgery and Topometric Parameters of the Cornea

Purpose of the study. To evaluate the efficiency of Femto-LASIK (femtosecond laser in situ keratomileusis), LASIK (laser in situ keratomileusis), and PRK (photorefractive keratectomy) and to compare the changes in topometric indices of the cornea. Materials and methods. The materials of 54 patients (108 eyes) were studied, of whom 34 were treated by the Femto-LASIK method, and 10 each by the LASIK and PRK methods. Visual acuity and topometric characteristics of the cornea were studied in all patients preoperatively and 3 months after surgery. Results. The uncorrected visual acuity before surgery was similar in all patients; after surgery, the improvement in uncorrected vision was more than 10-fold. The efficiency was comparatively higher with Femto-LASIK. The change in topometric indices in all groups had a similar direction, and only in PRK did it correlate with visual acuity. Conclusions. The uncorrected visual acuity in patients after Femto-LASIK, LASIK, and PRK surgery was similar (0.83±0.02, 0.86±0.04, and 0.8±0.02, respectively). In all patients, the topometric index IVA (index of vertical asymmetry) had a strong correlation with IHA (index of height asymmetry) and IHD (index of height decentration).