title: The recovery of optical quality after laser vision correction.
abstract: OBJECTIVE
  To evaluate the optical quality after laser in situ keratomileusis (LASIK) or serial photorefractive keratectomy (PRK) using a double-pass system and to follow the recovery of optical quality after laser vision correction.
  
  
  METHODS
  This study measured the visual acuity, manifest refraction and optical quality before and one day, one week, one month, and three months after laser vision correction. Optical quality parameters including the modulation transfer function, Strehl ratio and intraocular scattering were evaluated with a double-pass system.
  
  
  RESULTS
  This study included 51 eyes that underwent LASIK and 57 that underwent PRK. The optical quality three months post-surgery did not differ significantly between these laser vision correction techniques. Furthermore, the preoperative and postoperative optical quality did not differ significantly in either group. Optical quality recovered within one week after LASIK but took between one and three months to recover after PRK. The optical quality of patients in the PRK group seemed to recover slightly more slowly than their uncorrected distance visual acuity.
  
  
  CONCLUSIONS
  Optical quality recovers to the preoperative level after laser vision correction, so laser vision correction is efficacious for correcting myopia. The double-pass system is a useful tool for clinical assessment of optical quality.
authors.affiliation: HanGil Eye Hospital, Incheon, Korea.
authors.forename: Hyeong-Gi
authors.initials: HG
authors.lastname: Jung
authors.forename: Tae-Hyung
authors.initials: TH
authors.lastname: Lim
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D020731:Keratomileusis, Laser In Situ; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000601:surgery*; D018903:Photorefractive Keratectomy; D011183:Postoperative Complications; D011446:Prospective Studies; D020127:Recovery of Function; D016896:Treatment Outcome; D014792:Visual Acuity; D055815:Young Adult
keywords: Laser in situ keratomileusis; Optical Quality Analysis System; Optical quality
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