Corneal Ectasia after Photorefractive Keratectomy

Two cases are presented with corneal ectasia after photorefractive keratectomy (PRK). Case 1 is a 24-year-old man with manifest refractions of -6.0 DS, -3.0 DC, axis 180° in the right eye and -4.50 DS, -4.0 DC, axis 160° in the left eye respectively with a symmetric bow-tie pattern bilaterally, without any evidence of keratoconus on corneal topography preoperatively. Ectasia occurred 10 months after surgery in the right eye. Case 2 is a 20-year-old man with an attempted correction of −6.25 DS, -2.25 DC, axis 30° in the right eye, and −6.25 DS, −2.25 DC, axis 150° in the left eye. Thinnest central corneal thickness was 498μm and 499μm in the right and left eyes, respectively. Total ablation depth was 137 μm in the right eye and 136 μm in the left eye. 38 months after surgery ectasia developed in the left eye. Two patients had no family history suspicious for keratoconus. Copyright: 2021 The Author(s); Published by Kerman University of Medical Sciences. This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.