Rate of ectasia and incidence of irregular topography in patients with unidentified preoperative risk factors undergoing femtosecond laser-assisted LASIK
A 39-year-old woman underwent bilateral LASIK in January 2008. At 44 months after surgery, the patient complained of decreased vision in her right eye. At that time, the patient had UCVA of 20/30 in each eye and BCVA of 20/30 OD and 20/20 OS. The result of the Orbscan study showed signs of inferior steepening OD () and a normal post-LASIK central flattening OS. The most recent postoperative evaluation showed UCVA of 20/30 OD and 20/25 OS. The keratometry measured 40.90/43.80 OD and 41.80/43.10 OS, with Orbscan pachymetries of 421 μm OD and 407 μm OS. She currently wears spectacles to achieve BCVA.\nThe postoperative retrospective chart review revealed inferior steepening in the right eye () as well as a preoperative pachymetry measurement of 458 μm and a RSB of 254 μm in this eye, which suggests a previously unrecognized FFKC. There was no noted family history of keratoconus.