title: Delayed ectasia following LASIK with no risk factors: is a 300-microm stromal bed enough?
abstract: OBJECTIVE
  To report a case of ectasia occurring > 4 years following LASIK with no risk factors and a residual stromal bed > 300 microm.
  
  
  METHODS
  A 33-year-old woman presented 4 years after LASIK with mild blurring in the left eye. Uncorrected visual acuity (UCVA) had been 20/20 in both eyes previously.
  
  
  RESULTS
  Uncorrected visual acuity was 20/20 and 20/40 in the right and left eyes, respectively. Best spectacle-corrected visual acuity (BSCVA) was 20/20 with -0.75 +2.25 x 70 degrees refraction in the left eye, which matched topography. Preoperative corneal thickness was 595 microm, and topography showed no risk factors preoperatively or immediately postoperatively. Calculated residual stromal bed was 342 microm and measured 400 microm with ultrasound microscopy. One year postoperatively, UCVA decreased to 20/400, and BSCVA decreased to 20/60 with refraction of -4.50 +5.00 x 90 degrees. The patient was intolerant of contact lens wear and is considering collagen cross-linking, Intacs, or corneal transplantation.
  
  
  CONCLUSIONS
  Ectasia can occur more than 4 years after LASIK. Its etiology is unknown and management is challenging.
authors.affiliation: Department of Ophthalmology, University of Florida, Gainesville, Fla, USA. stuli@ufl.edu
authors.forename: Sonal S
authors.initials: SS
authors.lastname: Tuli
authors.forename: Sandhya
authors.initials: S
authors.lastname: Iyer
mesh_terms: D000328:Adult; D003316:Corneal Diseases / Q000209:etiology*; D003319:Corneal Stroma / Q000473:pathology*; D019781:Corneal Topography; D004108:Dilatation, Pathologic / Q000209:etiology; D005260:Female; D006801:Humans; D020731:Keratomileusis, Laser In Situ; D009216:Myopia / Q000601:surgery*; D011183:Postoperative Complications; D012307:Risk Factors; D014792:Visual Acuity