title: Videokeratography after excimer laser in situ keratomileusis for myopia.
abstract: OBJECTIVE
  The purpose of this study was to define qualitative patterns of videokeratography after excimer laser in situ keratomileusis (LASIK) for myopia and to identify associations of videokeratography patterns with clinical variables.
  
  
  METHODS
  Single-center, retrospective, cohort study.
  
  
  METHODS
  One hundred twenty-six eyes of 68 patients with myopia who desired surgical correction of myopia ranging from -1.50 to -8.80 diopters.
  
  
  METHODS
  Myopia was corrected with LASIK using a Summit OmniMed/Apex excimer laser. Computer-assisted videokeratography data were acquired at 3 months after primary LASIK, and associations of videokeratography pattern with clinical variable were assessed.
  
  
  METHODS
  Seven subgroup ablation zone patterns were characterized using tangential curvature maps; these subgroups were combined into pooled symmetric and asymmetric groups. Associations with age, attempted correction, single-zone or multizone ablation, postoperative uncorrected and spectacle-corrected visual acuity, predictability, astigmatism, corneal uniformity, glare disability, and contrast sensitivity were analyzed.
  
  
  RESULTS
  Thirty-two eyes (25.4%) showed a uniform pattern, 14 eyes (11.1%) showed a bow-tie pattern, 22 eyes (17.5%) showed a peninsula pattern, 22 eyes (17.5%) showed a semicircular pattern, 22 eyes (17.5%) showed an off-center blue spot pattern, 10 eyes (7.9%) showed an irregular pattern, and 4 eyes (3.2%) showed a central island pattern. Spectacle-corrected visual acuity, astigmatism, corneal uniformity, glare disability, and contrast sensitivity were significantly related to videokeratography pattern, although the difference among videokeratography groups was clinically small. Age, attempted correction, single- or multizone ablation, and postoperative uncorrected visual acuity and predictability were not predictive of videokeratography pattern.
  
  
  CONCLUSIONS
  Most eyes in this study had an asymmetric videokeratography pattern 3 months after LASIK. Small but statistically significant differences were identified among the videokeratography patterns that potentially may affect postoperative quality of vision.
authors.affiliation: Department of Ophthalmology, Emory University School of Medicine, Atlanta, Georgia, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Sano
authors.forename: J D
authors.initials: JD
authors.lastname: Carr
authors.forename: K
authors.initials: K
authors.lastname: Takei
authors.forename: K P
authors.initials: KP
authors.lastname: Thompson
authors.forename: R D
authors.initials: RD
authors.lastname: Stulting
authors.forename: G O
authors.initials: GO
authors.lastname: Waring
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D015331:Cohort Studies; D015350:Contrast Sensitivity; D003315:Cornea / Q000473:pathology* / Q000503:physiopathology / Q000601:surgery; D019781:Corneal Topography / Q000145:classification; D005260:Female; D019466:Glare; D006801:Humans; D020731:Keratomileusis, Laser In Situ; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000503:physiopathology / Q000601:surgery*; D012029:Refraction, Ocular; D012189:Retrospective Studies; D014792:Visual Acuity