title: Laser in situ keratomileusis with a scanning excimer laser for the correction of low to moderate myopia with and without astigmatism.
abstract: OBJECTIVE
  To evaluate the safety and effectiveness of and patient satisfaction with laser in situ keratomileusis (LASIK) performed with a scanning excimer laser by experienced surgeons to correct low and moderate levels of myopia and astigmatism.
  
  
  METHODS
  Clinique Laservue, Montreal, Quebec, Canada.
  
  
  METHODS
  A consecutive series of 125 patients (236 eyes) with myopia of -0.5 to -7.0 diopters (D) and cylinder less than 2.5 D were enrolled in this single-center prospective clinical trial. The patients were treated with LASIK and followed for 6 months. The System-ALK Automated Corneal Shaper microkeratome (Bausch & Lomb Surgical) with a 180 microm thickness plate and the Technolas 217 excimer laser (Bausch & Lomb Surgical) with PlanoScan software for the stromal ablation were used in all procedures. Since this version of PlanoScan tended to undercorrect, a mean of 14.7% was added to the standard nomogram. Patient satisfaction was assessed by questionnaires administered preoperatively and 1 and 6 months postoperatively. Retreatments for enhancement were not performed during the 6-month follow-up.
  
  
  RESULTS
  Six months after LASIK (86.4% follow-up), the mean postoperative manifest spherical equivalent was +0.02 D +/- 0.64 (SD) compared with a preoperative mean of -4.01 +/- 1.59 D. The uncorrected visual acuity was 20/40 or better in 94.6% of eyes and 20/20 or better in 81.9%. A total of 91.2% were within +/-1.0 D of emmetropia and 73.0% were within +/-0.5 D. Only 2 eyes were overcorrected by >1.0 D. Of the eyes with astigmatic myopia, 86.8% were within +/-1.0 D of the intended cylinder correction (by vector analysis) and 73.0% were within +/-0.5 D. The refractions were generally stable after 1 month, and the change in refraction between postoperative examinations was within +/-0.5 D in 88.0% of eyes. A 1-line decrease in best spectacle-corrected visual acuity was seen in 11.3% of eyes, and no eye lost more than 1 line. An increase of 1 or 2 lines was seen in 45.1%. No intraoperative problems occurred, and the interface was clear in all eyes. At 6 months, most symptoms present significantly more frequently than preoperatively were "mild"; none were "marked" or "severe." A total of 90.5% of eyes were reported with marked to extreme improvement in the overall quality of vision, and 99.0% of patients said they would choose LASIK surgery again.
  
  
  CONCLUSIONS
  Mild to moderate myopia, with and without astigmatism, was corrected safely, effectively, and predictably with a high degree of patient satisfaction using LASIK with a scanning excimer laser and the System-ALK Automated Corneal Shaper.
authors.affiliation: Clinique Laservue, Montreal, Quebec, Canada. Laservue@Laservue.net
authors.forename: G
authors.initials: G
authors.lastname: Balazsi
authors.forename: M
authors.initials: M
authors.lastname: Mullie
authors.forename: L
authors.initials: L
authors.lastname: Lasswell
authors.forename: P A
authors.initials: PA
authors.lastname: Lee
authors.forename: Y J
authors.initials: YJ
authors.lastname: Duh
mesh_terms: D000328:Adult; D001251:Astigmatism / Q000150:complications / Q000601:surgery*; D003315:Cornea / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007431:Intraoperative Complications; D020731:Keratomileusis, Laser In Situ / Q000379:methods*; D008297:Male; D009216:Myopia / Q000150:complications / Q000601:surgery*; D017060:Patient Satisfaction; D011183:Postoperative Complications; D011446:Prospective Studies; D012449:Safety; D011795:Surveys and Questionnaires; D016896:Treatment Outcome; D014792:Visual Acuity