title: Retreatment of decentered excimer photorefractive keratectomy ablations.
abstract: OBJECTIVE
  To present two cases of excimer photorefractive keratectomy decentration associated with visual distortion secondary to irregular astigmatism.
  
  
  METHODS
  Patients were retreated with a repeat photorefractive keratectomy using a technique whereby the circle of adherent epithelium overlying the decentered ablation served as a mask.
  
  
  RESULTS
  After retreatment, there was significant improvement in the patients' visual symptoms, decreased astigmatism on refraction, and better centration on corneal topography.
  
  
  CONCLUSIONS
  This method appears to offer an effective means to treat photorefractive keratectomy ablation zone decentration by improving the abnormalities introduced by the initial decentration.
authors.affiliation: Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St Louis, MO 63110, USA.
authors.forename: R
authors.initials: R
authors.lastname: Lim-Bon-Siong
authors.forename: J M
authors.initials: JM
authors.lastname: Williams
authors.forename: R F
authors.initials: RF
authors.lastname: Steinert
authors.forename: J S
authors.initials: JS
authors.lastname: Pepose
mesh_terms: D000328:Adult; D001251:Astigmatism / Q000209:etiology / Q000601:surgery; D003315:Cornea / Q000473:pathology; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007646:Keratotomy, Radial / Q000009:adverse effects*; D008297:Male; D012086:Reoperation; D013690:Television; D014786:Vision Disorders / Q000209:etiology / Q000601:surgery