title: [Corneal topographic analysis after excimer laser photorefractive keratectomy].
abstract: OBJECTIVE
  To analyze the changes in corneal topography after excimer laser photorefractive keratectomy (PRK).
  
  
  METHODS
  The topographic changes of 122 eyes (62 patients) and 96 eyes (49 patients) on which PRK was performed were reviewed after 3 and 6 months of follow-up respectively.
  
  
  RESULTS
  The central island pattern had a relationship with the loss of best corrected visual acuity of more than one line in early postoperative period. On subsequent follow-up, the central island pattern tended to become to other patterns (semicircular, keyhole and uniform) and the central corneal power decreased, allowing the visual acuity to improve gradually. The simulated K (Sim K) regression index was a useful indication of the changes in the corneal stroma. Sim K was related to the degree of refractive error. The greater the refractive error, the lower the Sim K.
  
  
  CONCLUSIONS
  Corneal topography is a useful tool in the analysis of corneal changes in PRK.
authors.affiliation: Eye Institute of Xuzhou, Xuzhou 221002.
authors.forename: H
authors.initials: H
authors.lastname: Jin
authors.forename: D
authors.initials: D
authors.lastname: Wang
authors.forename: Z
authors.initials: Z
authors.lastname: Li
mesh_terms: D019781:Corneal Topography; D006801:Humans; D054018:Lasers, Excimer; D009216:Myopia / Q000601:surgery*; D018903:Photorefractive Keratectomy / Q000379:methods*; D014792:Visual Acuity