Aspheric Versus Wavefront-Guided Photorefractive Keratectomy: Contralateral Eye Study Publisher Pubmed



Zareighanavati S¹ ; Gharaee H¹ ; Hamilton DR³ ; Sanchez PJ³ ; Abrishami M²
Source: Journal of Cataract and Refractive Surgery Published:2015

Abstract

Purpose To compare the refractive, visual, and aberrometric outcomes between wavefront-guided photorefractive keratectomy (PRK) and aspheric PRK in myopic patients. Setting Khatam-al-Anbia Eye Hospital, Mashhad, Iran. Design Prospective randomized clinical trial. Methods One eye of each patient was randomly assigned to excimer laser wavefront-guided PRK (Zyoptix) and the other eye to excimer laser aspheric PRK (Technolas 217z). The preoperative and 3-month and 6-month postoperative refractive errors, visual acuity, contrast sensitivity, and higher-order aberrations (HOAs) were compared between the groups. Results Ninety-six eyes (48 patients) were enrolled. At the last postoperative visit, there were no between-group differences in uncorrected distance visual acuity (UDVA) (P =.987) or corrected distance visual acuity (P =.416). The mean spherical equivalent was -0.076 diopter (D) ± 0.029 (SD) in the wavefront-guided group and -0.077 ± 0.075 D in the aspheric PRK group (P =.684). Postoperatively, the mean area under the log of contrast sensitivity function (AULCSF) with and without glare testing improved over preoperative values (both P <.001). There was no statistically significant between-group difference in the AULCSF with glare (P =.903) or without glare (P =.978). Total HOAs increased after PRK in both groups, although aspheric PRK induced fewer HOAs than wavefront-guided PRK (P =.04). Conclusions Both PRK methods equally improved postoperative UDVA and contrast sensitivity. The HOAs increased after treatment with both methods; however, aspheric ablation induced statistically fewer HOAs than wavefront-guided ablation. Financial Disclosure No author has a financial or proprietary interest in any material or method mentioned. © 2015 ASCRS and ESCRS.