Topoaberrometric changes in myopia operated with surface techniques

Abstract

Introduction: The refractive surgery as surgical method to treat the myopia is a solution that offers to the patients when they don't tolerate the contact lenses, it presents visual aberrations as consequence of the use of glasses with high diopters or reject the use of glasses for esthetic reasons.

Objetive: To compare topoaberrometric changes in myopic patients operated with surface techniques and aspheric ablation profile.

Methods: An open randomized controlled experimental study was performed in 160 patients (320 eyes). Two groups were formed, the first group (control group, 80 patients with 160 eyes) underwent the surgical technique photorefractive keratectomy with mitomycin C and the second group (study group, 80 patients with 160 eyes) subepithelial keratectomy assisted by excimer laser, at the Cuban Institute of Ophthalmology ¨Ramón Pando Ferrer¨.

Results: Women predominated in both groups, the variation between preoperative and three months postoperative in the control group was, corneal asphericity from -0.31 ± 0.10 µm to 0.25 ± 0.09 µm, total RMS 4.17 ± 1.84 µm to 1.05 ± 0.44 µm, high order RMS from 0.24 ± 0.15 µm to 0.38 ± 0.15 µm, spherical aberration from -0.84 ± 1.14 µm to -2.42 ± 2.12 um. In the study group, the variation between preoperative and three months postoperative was, corneal asphericity from -0.29 ± 0.09 µm to 0.29 ± 0.37 um, total RMS from 4.18 ± 1.93 µm to 1.04 ± 0.45 µm, high order RMS from 0.25 ± 0.14 µm to 0.40 ± 0.15 µm, spherical aberration from -0.83 ± 1.19 µm to -2.43 ± 2.15 µm. There were no significant differences between the two groups.

Conclusions: Both surgical techniques were shown to improve visual quality in myopic patients and can be performed interchangeably, as there are no significant differences between them.