title: Retreatment of regression after photorefractive keratectomy for myopia.
abstract: OBJECTIVE
  To study results of retreatment after regression in myopic patients who underwent photorefractive keratectomy (PRK).
  
  
  METHODS
  Procedures were performed with the Nidek EC-5000 excimer laser. This was a retrospective study of 20 of 2127 patients, with follow-up of at least 6 months, who underwent repeated excimer laser ablation.
  
  
  RESULTS
  No patient with low myopia had regression. We evaluated six eyes (group I) with moderate myopia; 13 eyes (group II) with high myopia; and ten eyes (group III) with extreme myopia. Average uncorrected visual acuity at 6 months after retreatment was 0.73 +/- 0.21 in group I, 0.64 +/- 0.35 in group II, and 0.61 +/- 0.38 in group III. At six months after retreatment, the average was -0.36 +/- 1.05 D in group I, -0.42 +/- 1.12 D in group II, and -1.40 +/- 1.62 D in group III.
  
  
  CONCLUSIONS
  The amount and frequency of regression was higher in patients with high and extreme myopia; however, the preliminary results of retreatment of regression were satisfactory.
authors.affiliation: New Line Vision Ophthalmology Research Center, Moscow, Russia.
authors.forename: E K
authors.initials: EK
authors.lastname: Vorotnikova
authors.forename: V V
authors.initials: VV
authors.lastname: Kourenkov
authors.forename: G S
authors.initials: GS
authors.lastname: Polunin
mesh_terms: D000328:Adult; D003315:Cornea / Q000601:surgery*; D006801:Humans; D054018:Lasers, Excimer; D009216:Myopia / Q000601:surgery*; D018903:Photorefractive Keratectomy; D012008:Recurrence; D012086:Reoperation; D012189:Retrospective Studies; D016896:Treatment Outcome; D014792:Visual Acuity