Rate of ectasia and incidence of irregular topography in patients with unidentified preoperative risk factors undergoing femtosecond laser-assisted LASIK
A 20-year-old woman underwent bilateral LASIK in July 2007. By 21 months postop, the patient began to experience blurred vision OD, with UCVA of 20/30 in the right eye (OD) and 20/20 in the left eye (OS); the best corrected visual acuity (BCVA) was 20/20 OD and 20/15 OS, and corneal topography showed inferonasal steepening OD (), with a normal post-LASIK appearance OS. At the most recent follow up, the UCVA was 20/50 OD and BCVA was 20/25. Topography demonstrated inferonasal corneal ectasia OD, with simulated keratometry (SimK) measurements of 42.12/48.75 and Orbscan pachymetry thickness of 392 mm OD at the tip of the cone. The postoperative course of her left eye remained uncomplicated. The patient currently wears a rigid gas permeable lens in her right eye.\nThe postoperative retrospective chart review revealed FFKC bilaterally, with an acceptable central corneal power (<47.2 D) and an inferosuperior asymmetry value of 3.0 D in the affected eye (). There was no noted family history of keratoconus.