title: Correlation of visual and refractive outcomes between eyes after same-session bilateral laser in situ keratomileusis surgery.
abstract: OBJECTIVE
  To determine whether between-eye refractive and visual outcomes after same-session laser in situ keratomileusis (LASIK) surgery are correlated, and to determine whether suboptimal visual and refractive outcomes in one eye are predictive of poor results in the fellow eye.
  
  
  METHODS
  Observational case series.
  
  
  METHODS
  Retrospective chart review. A total of 484 eyes of 242 patients met inclusion criteria of having undergone same-day LASIK surgery and having 3-month refractive and visual acuity outcomes. Statistical comparisons of outcomes were performed, including between-eye Pearson correlation analysis and logistic regression models for predicting second-eye outcome. Main outcome measures were 1-month, 3-month, and 6-month uncorrected visual acuity and manifest refraction.
  
  
  RESULTS
  Refractive outcomes at 1, 3, and 6 months between first (right) and second eyes were not found to be significantly different. No difference in uncorrected or best spectacle-corrected visual acuity was observed between first and second eyes Refractive outcomes of spherical equivalent, sphere, and cylinder and visual outcomes of uncorrected and best spectacle-corrected visual acuity were highly correlated between the two eyes. Analysis of cases with suboptimal outcomes (> or =1 diopter from intended correction or uncorrected acuity equal to or worse than 20/40) suggests that a poor refractive or visual outcome in the first eye increases the risk of a poor outcome in the second eye by approximately 20-fold.
  
  
  CONCLUSIONS
  Retrospective analysis of refractive and visual outcomes from patients undergoing same-session bilateral LASIK demonstrates a high correlation of refractive and visual outcome between the eyes.
authors.affiliation: Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St. Louis, Missouri, USA.
authors.forename: Russell N
authors.initials: RN
authors.lastname: Van Gelder
authors.forename: Karen
authors.initials: K
authors.lastname: Steger-May
authors.forename: Jay S
authors.initials: JS
authors.lastname: Pepose
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003315:Cornea / Q000503:physiopathology / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D020731:Keratomileusis, Laser In Situ; D008297:Male; D008875:Middle Aged; D012029:Refraction, Ocular / Q000502:physiology*; D012030:Refractive Errors / Q000503:physiopathology; D054140:Refractive Surgical Procedures; D012189:Retrospective Studies; D016896:Treatment Outcome; D014792:Visual Acuity / Q000502:physiology*