title: Keratoconus managed with intacs: one-year results.
abstract: OBJECTIVE
  To describe the visual outcome of keratoconus managed with Intacs implantation (Addition Technology Inc, Fremont, Calif) and to define criteria that predict good outcome.
  
  
  METHODS
  This retrospective, nonrandomized, comparative, consecutive case series studied 58 eyes of 43 patients with keratoconus managed by Intacs implantation. The outcome measures were analyzed pre-Intacs and 1 year post-Intacs. Preoperative parameters were correlated with outcome.
  
  
  METHODS
  Uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BSCVA), manifest refraction, videokeratography, and patient questionnaires.
  
  
  RESULTS
  Intacs were implanted in all eyes with no intraoperative complications. Six eyes underwent additional Intacs surgery. Post-Intacs, the mean +/- SD UCVA improved from less than 20/200 +/- 0.1 line to 20/50(-3) +/- 3.1 lines, the mean +/- SD BSCVA was unchanged at 20/32 +/- 2.0 lines, the mean +/- SD spherical equivalent improved from -3.88 +/- 1.64 to -1.04 +/- 1.51 diopters (D), and the mean +/- SD astigmatism improved from 3.34 +/- 2.23 to 1.97 +/- 1.51 D. Twenty-five eyes had a good outcome (UCVA> or =20/40). Multiple regression selected BSCVA, astigmatism, and spherical myopia as the preoperative predictors of outcome.
  
  
  CONCLUSIONS
  Intacs improve myopia and regular astigmatism in keratoconus. Milder keratoconus (BSCVA>20/32(-2) and astigmatism<3.50 D) and significant spherical myopia (>-1.75) predict better outcome.
authors.affiliation: Enaim Refractive Surgery Center, Jerusalem, Israel.
authors.forename: Samuel
authors.initials: S
authors.lastname: Levinger
authors.forename: Russell
authors.initials: R
authors.lastname: Pokroy
mesh_terms: D000328:Adult; D003319:Corneal Stroma / Q000503:physiopathology / Q000601:surgery*; D019781:Corneal Topography; D005260:Female; D006801:Humans; D007431:Intraoperative Complications; D007640:Keratoconus / Q000503:physiopathology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D019904:Polymethyl Methacrylate; D019736:Prostheses and Implants; D019919:Prosthesis Implantation; D012029:Refraction, Ocular / Q000502:physiology; D012086:Reoperation; D012189:Retrospective Studies; D011795:Surveys and Questionnaires; D016896:Treatment Outcome; D014792:Visual Acuity / Q000502:physiology
chemical_list: D019904:Polymethyl Methacrylate