title: Wavefront-guided LASIK for myopia with the Technolas 217z: results at 3 years.
abstract: OBJECTIVE
  To evaluate the clinical outcome of wavefront-guided LASIK in patients with low to high myopia.
  
  
  METHODS
  The study included 316 eyes of 158 patients; 172 eyes with low to moderate myopia (< or = 6.00 diopters [D]) and 144 eyes with high myopia (> or = 6.25 D). Preoperative wavefront analysis was performed with the Hartmann-Shack aberrometer, and LASIK was done with the Technolas 217z excimer laser. Follow-up was 36 months. Safety, efficacy, predictability, stability, and complications were compared between groups.
  
  
  RESULTS
  Mean preoperative spherical equivalent refraction (SE) was -6.50 +/- 7.72 D (range: -1.50 to -16.00 D) in the entire study group, -4.91 +/- 1.38 D in the low to moderate myopia group, and -9.41 +/- 2.51 D in the high myopia group. At 36 months, 222 (70%) eyes showed no change in best spectacle-corrected visual acuity and 67 (21%) eyes gained > or = 1 line. In the low to moderate myopia group, SE of +/- 0.50 D was achieved by 85% of eyes and +/- 1.00 D by 97%, and 65% and 80%, respectively, in the high myopia group. Undercorrection > 0.50 D was observed in 25% (36 eyes) of the high myopia group and 5% (8 eyes) of the low to moderate myopia group. All eyes showed significant reduction in spherical aberration (Z4,0) at 12 months postoperatively with no complications except diffuse lamellar keratitis in 2 eyes (1 eye in each group).
  
  
  CONCLUSIONS
  Wavefront-guided LASIK is an efficient refractive surgery technique for patients with low to moderate myopia. Higher degrees of myopia may be subject to under- and overcorrection.
authors.affiliation: Department of Ophthalmology, Rabin Medical Center, Beilinson Campus, Petah Tiqva, Israel. iritbahar@yahoo.com
authors.forename: Irit
authors.initials: I
authors.lastname: Bahar
authors.forename: Shmuel
authors.initials: S
authors.lastname: Levinger
authors.forename: Israel
authors.initials: I
authors.lastname: Kremer
mesh_terms: D000328:Adult; D003315:Cornea / Q000503:physiopathology / Q000601:surgery*; D019781:Corneal Topography; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D020731:Keratomileusis, Laser In Situ / Q000295:instrumentation / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000503:physiopathology / Q000601:surgery*; D011183:Postoperative Complications; D012029:Refraction, Ocular / Q000502:physiology; D012189:Retrospective Studies; D016896:Treatment Outcome; D014792:Visual Acuity / Q000502:physiology