Corneal Ectasia after Photorefractive Keratectomy

Two cases are presented with corneal ectasia after photorefractive keratectomy (PRK). Case ۱ is a ۲۴-year-old man with manifest refractions of -۶.۰ DS, -۳.۰ DC, axis ۱۸۰° in the right eye and -۴.۵۰ DS, -۴.۰ DC, axis ۱۶۰° in the left eye respectively with a symmetric bow-tie pattern bilaterally, without any evidence of keratoconus on corneal topography preoperatively. Ectasia occurred ۱۰ months after surgery in the right eye.Case ۲ is a ۲۰-year-old man with an attempted correction of −۶.۲۵ DS, -۲.۲۵ DC, axis ۳۰° in the right eye, and −۶.۲۵ DS, −۲.۲۵ DC, axis ۱۵۰° in the left eye. Thinnest central corneal thickness was ۴۹۸µm and ۴۹۹µm in the right and left eyes, respectively. Total ablation depth was ۱۳۷ µm in the right eye and ۱۳۶ µm in the left eye. ۳۸ months after surgery ectasia developed in the left eye. Two patients had no family history suspicious for keratoconus.Copyright: ۲۰۲۱ 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/۴.۰), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.