title: Removal of corneal epithelium with phototherapeutic technique during multizone, multipass photorefractive keratectomy.
abstract: BACKGROUND
  The therapeutic mode of the VISX 20/20 excimer laser was used to remove the corneal epithelium prior to performing photorefractive keratectomy (PRK) with a multizone, multipass technique.
  
  
  METHODS
  A retrospective analysis was performed of 120 eyes of 90 patients that were treated for preoperative spherical refractive errors from -1.00 to -7.00 diopters (D) (mean -3.90 D, SD 1.54) by one surgeon (DGJ) over 7 months.
  
  
  RESULTS
  Six-month follow-up was obtained in 76 eyes (63%). Sixty-nine eyes (91%) achieved a spherical equivalent refraction within +/-1.00 D of emmetropia. Regression of effect averaged -0.35 D (SD 0.53 D) from 1 to 6 months after surgery. Mean postoperative uncorrected visual acuity at 6 months was 20/25 (range 20/15 to 20/200). Seventy-three eyes (96%) achieved uncorrected visual acuity of 20/40 or better, 67 (88%) achieved uncorrected visual acuity of 20/25 or better, and 76 (71%) achieved 20/20 or better. Three eyes (4%) lost one line of spectacle-corrected visual acuity; no eye lost more than one line. There were no significant surgical complications.
  
  
  CONCLUSIONS
  Removal of corneal epithelium with the Summit Excimed UV 200 LA excimer laser using multizone, multipass photoablation yields visual and refractive results that compare favorably with published PRK series with excellent short-term stability.
authors.affiliation: London Place Eye Center, New Westminster, British Columbia, Canada.
authors.forename: D G
authors.initials: DG
authors.lastname: Johnson
authors.forename: G M
authors.initials: GM
authors.lastname: Kezirian
authors.forename: S P
authors.initials: SP
authors.lastname: George
authors.forename: J C
authors.initials: JC
authors.lastname: Casebeer
authors.forename: J
authors.initials: J
authors.lastname: Ashton
mesh_terms: D000293:Adolescent; D000328:Adult; D019573:Epithelium, Corneal / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D054018:Lasers, Excimer; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000601:surgery*; D018903:Photorefractive Keratectomy / Q000379:methods*; D012189:Retrospective Studies; D016896:Treatment Outcome; D014792:Visual Acuity; D014945:Wound Healing