title: [Analysis of refractive state after excimer laser photorefractive keratectomy in myopia].
abstract: OBJECTIVE
  To evaluate refractive state after excimer laser photorefractive keratectomy (PRK) in patients with myopia.
  
  
  METHODS
  234 cases(391 eyes) followed up for two years were divided into two groups, group I: mild and moderate myopia(< or = -6.00 D), 228 eyes; group II: High myopia(> -6.00 D), 163 eyes. The refractive state of patients at three, six, twelve and twenty-four months postoperatively were monitored.
  
  
  RESULTS
  At two years after photorefractive keratectomy (PRK), refractive regression (> -0.5 D), overcorrection(> 1.00 D), undercorrection(> 1.00 D), postoperative residual astigmatism postoperative astigmatism and hyperopia shift in group I were 1.7%, 4.4%, 5.7%, 12.8%, 7.4% and 7.5% respectively, while in high myopia group were 15.9%, 4.9%, 23.3%, 29.7%, 31.1% and 6.7% respectively.
  
  
  CONCLUSIONS
  The results prove that photorefractive keratectomy is an effective, precise, stable and safe method for correction of mild and moderate myopia, but insufficient for high myopia.
authors.affiliation: Ophthalmic Laser Center, Xiangya Hospital, HuNan Medical University, Changsha 410078, China.
authors.forename: S
authors.initials: S
authors.lastname: Liu
authors.forename: X
authors.initials: X
authors.lastname: Wu
authors.forename: P
authors.initials: P
authors.lastname: Wang
authors.forename: P
authors.initials: P
authors.lastname: Huang
authors.forename: X
authors.initials: X
authors.lastname: Xia
authors.forename: X
authors.initials: X
authors.lastname: Tan
authors.forename: E
authors.initials: E
authors.lastname: Mei
authors.forename: S
authors.initials: S
authors.lastname: Hu
mesh_terms: D000293:Adolescent; D000328:Adult; D001251:Astigmatism / Q000209:etiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D054018:Lasers, Excimer; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000601:surgery*; D018903:Photorefractive Keratectomy / Q000009:adverse effects*; D014792:Visual Acuity