Corneal Ectasia after Photorefractive Keratectomy

Document Type : Case Report


1 Eye Research Center, Khatam-al-Anbia Eye Hospital, Mashhad University of Medical Sciences, Mashhad, Iran

2 Ophthalmology Department, Razi Hospital, Birjand University of Medical Sciences, Birjand, Iran


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 (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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