title: Corneal ectasia after photorefractive keratectomy.
abstract: Two patients developed corneal ectasia after photorefractive keratectomy (PRK). Case 1 had evidence of early keratoconus preoperatively, with manifest refractions of -4.00 +2.50 x 160 (20/20) in the right eye and -7.00 +3.00 x 180 (20/30) in the left eye; thin corneas (472 microm and 441 microm, respectively); and inferior paracentral steepening in the right eye and central steepening in the left eye on topography. Case 2 had manifest refractions of -8.50 +3.75 x 123 (20/20(-2)) in the right eye and -9.25 +4.00 x 077 (20/20(-1)) in the left eye; corneal thickness of 509 microm and 508 microm, respectively; and symmetric bow-tie patterns in both eyes on topography. Case 2 had a family history suspicious for keratoconus, with a sibling who had bilateral corneal transplantation at a young age. Both patients developed bilateral corneal ectasia after PRK.
authors.affiliation: Emory University Department of Ophthalmology and Emory Vision, Atlanta, Georgia 30322, USA. jrandle@emory.edu
authors.forename: J Bradley
authors.initials: JB
authors.lastname: Randleman
authors.forename: Andrew I
authors.initials: AI
authors.lastname: Caster
authors.forename: Christopher S
authors.initials: CS
authors.lastname: Banning
authors.forename: R Doyle
authors.initials: RD
authors.lastname: Stulting
mesh_terms: D000328:Adult; D001699:Biometry; D003315:Cornea / Q000473:pathology*; D003316:Corneal Diseases / Q000209:etiology*; D019781:Corneal Topography; D004108:Dilatation, Pathologic / Q000209:etiology; D006801:Humans; D054018:Lasers, Excimer; D008297:Male; D018903:Photorefractive Keratectomy / Q000009:adverse effects*; D012307:Risk Factors; D014792:Visual Acuity