title: Excimer laser photorefractive keratectomy for the correction of myopia.
abstract: OBJECTIVE
  To ascertain the efficacy, predictability, safety and stability of photorefractive keratectomy (PRK) for the correction of myopia.
  
  
  METHODS
  Nine-hundred and seventy-one eyes of 628 patients had PRK performed for the correction of myopia. The mean pre-operative myopia was -5.7 D +/- 2.21 D (range -1.0 D to -15.25 D). The mean attempted correction was -5.0 D +/- 1.9 D (range -1.0 D to -9.90 D).
  
  
  RESULTS
  Four-hundred and sixty-seven eyes had a follow-up of 6 months or more. Ninety-three percent of low myopic eyes (pre-operative myopia of less than or equal to 6.0 D) and 75% of high myopic eyes (pre-operative myopia of more than 6.0 D) attained an unaided visual acuity of 6/12 or better. Seventy-four percent of low myopic and 50% of high myopic eyes were within 1 D of the intended correction. The mean post-operative refraction at 6 months was 0.60 D +/- 1.46 D. Eight eyes in the high myopia group and 1 eye in the low myope group lost 2 or more lines or best-corrected visual acuity.
  
  
  CONCLUSIONS
  PRK was safer and produced better results for low myopes.
authors.affiliation: Department of Ophthalmology, National University Hospital, Singapore.
authors.forename: T L
authors.initials: TL
authors.lastname: Wee
authors.forename: W K
authors.initials: WK
authors.lastname: Chan
authors.forename: P
authors.initials: P
authors.lastname: Tseng
authors.forename: D
authors.initials: D
authors.lastname: Tan
authors.forename: V
authors.initials: V
authors.lastname: Balakrishnan
authors.forename: C H
authors.initials: CH
authors.lastname: Low
mesh_terms: D000328:Adult; D004869:Equipment Safety; D005260:Female; D006801:Humans; D054018:Lasers, Excimer; D008297:Male; D009216:Myopia / Q000601:surgery*; D018903:Photorefractive Keratectomy; D012029:Refraction, Ocular; D012846:Singapore; D016896:Treatment Outcome