title: Outcomes after laser in situ keratomileusis retreatment in high myopes.
abstract: OBJECTIVE
  To evaluate the refractive and visual performance after laser in situ keratomileusis (LASIK) retreatment.
  
  
  METHODS
  A retrospective study was performed on 33 eyes of 23 patients who underwent LASIK (Bausch & Lomb Technolas 217C) retreatment for residual myopia with or without astigmatism. Parameters evaluated were uncorrected and best spectacle-corrected visual acuity, spherical equivalent refraction, contrast sensitivity, glare acuity, and pachymetry, preoperatively and at 1, 3, and 6 months postoperatively.
  
  
  RESULTS
  The mean spherical equivalent refraction before primary LASIK was -9.89 +/- 4.00 D and before retreatment was -2.85 +/- 2.17 D. Although contrast sensitivity and glare acuity decreased significantly after primary LASIK (P<.05), no significant change in these parameters was observed after retreatment. Smaller ablation zones were associated with decreased contrast sensitivity and glare acuity after primary LASIK as well as following retreatment. Contrast sensitivity and glare acuity following primary LASIK were significantly better in eyes with ablation zones > or = 5 mm than those with < 5 mm (P<.05). Eyes in which the ablation zone was the same as that for primary LASIK had significantly better contrast sensitivity than those with different ablation zones (increased or decreased) during retreatment. Attempted refractive correction during primary LASIK and retreatment had a significant negative correlation with contrast sensitivity and glare acuity following primary LASIK as well as retreatment.
  
  
  CONCLUSIONS
  The ablation zones following primary LASIK and retreatment should be > or = 5.00 mm and remain unchanged to improve visual performance.
authors.affiliation: Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi.
authors.forename: Alka
authors.initials: A
authors.lastname: Rani
authors.forename: Ramamurthy
authors.initials: R
authors.lastname: Balasubramanya
authors.forename: Namrata
authors.initials: N
authors.lastname: Sharma
authors.forename: Radhika
authors.initials: R
authors.lastname: Tandon
authors.forename: Rasik B
authors.initials: RB
authors.lastname: Vajpayee
authors.forename: Vijay K
authors.initials: VK
authors.lastname: Dada
authors.forename: Rajvir
authors.initials: R
authors.lastname: Singh
mesh_terms: D000293:Adolescent; D000328:Adult; D001251:Astigmatism / Q000601:surgery; D015350:Contrast Sensitivity; D003315:Cornea / Q000473:pathology* / Q000601:surgery; D005260:Female; D006801:Humans; D020731:Keratomileusis, Laser In Situ / Q000379:methods*; D008297:Male; D009216:Myopia / Q000601:surgery*; D012029:Refraction, Ocular; D012086:Reoperation; D012189:Retrospective Studies; D016896:Treatment Outcome; D014792:Visual Acuity