Rate of ectasia and incidence of irregular topography in patients with unidentified preoperative risk factors undergoing femtosecond laser-assisted LASIK
A 30-year-old male underwent bilateral LASIK in June 2007. At 20 months postprocedure, the patient experienced progressive blurring in his left eye. The UCVA was 20/25 OD and 20/150 OS, with a BCVA of 20/20 OU, corresponding to a manifest refraction of −0.50 +0.75×153 OD and −4.50 +3.25 ×030 OS.\nBy 22 months he complained of progressive blurring of his left eye. The UCVA was 20/200 OS and BCVA was 20/25, with an increase in average keratometry from 40.30 D to 42.37 D. Corneal topography showed significant inferior ectasia (), and Orbscan pachymetry measured 523 μm. The patient currently wears rigid gas permeable contact lenses to achieve a BCVA of 20/20 OS.\nThe retrospective review of the preoperative data showed relatively normal topography with no clear indication of keratoconus and no other risk factors for the development of postoperative ectasia (). There was no noted family history of keratoconus.