title: CustomCornea wavefront retreatment after conventional laser in situ keratomileusis.
abstract: OBJECTIVE
  To evaluate the safety and efficacy of performing laser in situ keratomileusis (LASIK) retreatment using the Alcon CustomCornea system in patients who had prior myopic LASIK using conventional (nonwavefront) software.
  
  
  METHODS
  Private practice ophthalmology clinic, St. Paul, Minnesota, USA.
  
  
  METHODS
  In this prospective interventional trial, consecutive patients having CustomCornea retreatment following conventional LASIK were evaluated. Main outcome measures were uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), refractive error, and higher-order aberrations (HOAs).
  
  
  RESULTS
  Fourteen eyes of 10 patients were evaluated, with a mean follow-up of 5.3 months (range 6.2 to 15.4 months). Mean UCVA improved from 20/50 (logMAR) to 20/26 (P<.001). Mean spherical equivalent changed from -1.45 diopters (D) to +0.52 (P<.00001). Total aberrations, HOAs, defocus, and spherical aberration improved significantly. No eye lost a line of BCVA; 4 eyes (28.6%) gained 1 line, and 1 eye (7.1%) gained 2 lines. Ten eyes (71.4%) were within 0.5 D of emmetropia. Four eyes were overcorrected by 1.00 to 2.00 D. Risk factors for overcorrection included increased HOAs, higher spherical aberration, and not using the surgeon's offset at the time of surgery.
  
  
  CONCLUSIONS
  Wavefront retreatment following conventional LASIK is safe and effective. Care must be taken when treating patients with higher amounts of total aberration, especially spherical aberration. Refractive results are closer to emmetropia when the surgeon's offset is used.
authors.affiliation: Associated Eye Care, Lake Elmo, Minnesota 55042, USA. gsschwartz@associatedeyecare.com
authors.forename: Gary S
authors.initials: GS
authors.lastname: Schwartz
authors.forename: David H
authors.initials: DH
authors.lastname: Park
authors.forename: Stephen S
authors.initials: SS
authors.lastname: Lane
mesh_terms: D000328:Adult; D001251:Astigmatism / Q000601:surgery*; D003319:Corneal Stroma / Q000601:surgery; D019781:Corneal Topography / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D020731:Keratomileusis, Laser In Situ / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000601:surgery*; D011183:Postoperative Complications / Q000601:surgery*; D011446:Prospective Studies; D012086:Reoperation; D012449:Safety; D013524:Surgical Flaps; D016896:Treatment Outcome; D014792:Visual Acuity