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Journal of Ophthalmology
Volume 2017 (2017), Article ID 8725172, 5 pages
https://doi.org/10.1155/2017/8725172
Clinical Study

Photorefractive Keratectomy for Residual Myopia after Myopic Laser In Situ Keratomileusis

Ophthalmology Department, Zagazig University, Zagazig, Egypt

Correspondence should be addressed to Kamal A. M. Solaiman

Received 9 September 2016; Accepted 1 December 2016; Published 12 January 2017

Academic Editor: Majid M. Moshirfar

Copyright © 2017 Kamal A. M. Solaiman et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose. To evaluate the safety, efficacy, and predictability of photorefractive keratectomy (PRK) on the corneal flap for correction of residual myopia following myopic laser in situ keratomileusis (LASIK). Patients and Methods. A retrospective study on eyes retreated by PRK on the corneal flap for residual myopia after LASIK. All eyes had no enough stroma after LASIK sufficient for LASIK enhancement. Data included spherical equivalent (SE), uncorrected and best corrected visual acuity (UCVA and BCVA), central pachymetry, corneal higher order aberrations (HOAs), corneal hysteresis (CH), corneal resistance factor (CRF), and corneal haze. Results. The study included 64 eyes. Before PRK, the mean central pachymetry was μm, the mean SE was − D, and the mean UCVA and BCVA were and , respectively. 12 months postoperatively, the mean central corneal thickness was μm, the mean SE was − D (), and the mean UCVA and BCVA were () and (), respectively. The safety index was 1.01 and the efficacy index was 0.86. No significant change was observed in corneal HOAs. Conclusions. Residual myopia less than 3 D after LASIK could be safely and effectively treated by PRK and mitomycin C with a high predictability. This prevents postoperative ectasia and avoids the flap related complications but has no significant effect on HOAs.