title: Visual and refractive outcomes of small incision lenticule extraction for the correction of myopia: 1-year follow-up.
abstract: OBJECTIVE
  To assess the 1 year clinical outcomes of small incision lenticule extraction (SMILE) for the correction of myopia and myopic astigmatism using a 500 kHz femtosecond laser system.
  
  
  METHODS
  This prospective study evaluated 52 eyes of 39 consecutive patients (31.8±6.9 years, mean age±SD) with spherical equivalents of -4.11±1.73 D (range, -1.25 to -8.25 D) who underwent SMILE for myopia and myopic astigmatism. Preoperatively, 1 week, and 1, 3, 6 and 12 months postoperatively, we assessed the safety, efficacy, predictability, stability, corneal endothelial cell loss and the adverse events of the surgery.
  
  
  RESULTS
  The logarithm of the minimal angle of resolution (logMAR) uncorrected distance visual acuity and LogMAR corrected distance visual acuity were -0.16±0.11 and -0.22±0.07, respectively, 1 year postoperatively. At 1 year, all eyes were within±0.5 D of the targeted correction. Manifest refraction changes of -0.05±0.32 D occurred from 1 week to 1 year postoperatively (p=0.20, Wilcoxon signed-rank test). The endothelial cell density was not significantly changed from 2804±267 cells/mm(2) preoperatively to 2743±308 cells/mm(2) 1 year postoperatively (p=0.12). No vision-threatening complications occurred during the observation period.
  
  
  CONCLUSIONS
  SMILE performed well in the correction of myopia and myopic astigmatism, and no significant change in endothelial cell density or any other serious complications occurred throughout the 1-year follow-up period, suggesting its viability as a surgical option for the treatment of such eyes.
authors.affiliation: Department of Ophthalmology, University of Kitasato School of Medicine, Kanagawa, Japan.
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Kamiya
authors.affiliation: Department of Ophthalmology, University of Kitasato School of Medicine, Kanagawa, Japan.
authors.forename: Kimiya
authors.initials: K
authors.lastname: Shimizu
authors.affiliation: Department of Ophthalmology, University of Kitasato School of Medicine, Kanagawa, Japan.
authors.forename: Akihito
authors.initials: A
authors.lastname: Igarashi
authors.affiliation: Department of Ophthalmology, University of Kitasato School of Medicine, Kanagawa, Japan.
authors.forename: Hidenaga
authors.initials: H
authors.lastname: Kobashi
mesh_terms: D000328:Adult; D001251:Astigmatism / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007564:Japan; D053685:Laser Therapy; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000601:surgery*; D011446:Prospective Studies; D016896:Treatment Outcome; D014792:Visual Acuity; D055815:Young Adult
keywords: OPHTHALMOLOGY