title: Postoperative pain following epi-LASIK, LASEK, and PRK for myopia.
abstract: OBJECTIVE
  To compare mechanical epithelial separation using the epi-LASIK technique with alcohol assisted separation (LASEK).
  
  
  METHODS
  Patients deemed suitable for surface ablation were randomized to receive epi-LASIK in one eye and LASEK in the other eye. If epi-LASIK failed, the procedure was converted to photorefractive keratectomy (PRK), forming the third comparison group. The outcome measures were postoperative pain, vision, refraction, and haze. Patients were followed for 3 months.
  
  
  RESULTS
  Fifty-seven patients (95 eyes) were included in this study (38 epi-LASIK, 19 PRK, and 38 LASEK eyes). There was a 33% rate of conversion from intended epi-LASIK to PRK. Epi-LASIK patients were found to have significantly less pain in the first few hours after surgery but at 4 hours all patients had the same levels of pain, which improved to minimal or no pain at 24 hours. No significant difference was noted among groups for vision, refractive error, and haze; however, epi-LASIK patients had the best day 1 visual acuity.
  
  
  CONCLUSIONS
  Epi-LASIK offers comparable visual and refractive results to other surface ablation techniques with lower levels of postoperative pain only for the first 2 hours. However, there was a high rate of flap failure and conversion to PRK.
authors.affiliation: Mater Private Hospital, Dublin, Ireland. maeveodoherty@eircom.net
authors.forename: Maeve
authors.initials: M
authors.lastname: O'Doherty
authors.forename: Caitriona
authors.initials: C
authors.lastname: Kirwan
authors.forename: Michael
authors.initials: M
authors.lastname: O'Keeffe
authors.forename: John
authors.initials: J
authors.lastname: O'Doherty
mesh_terms: D000328:Adult; D005500:Follow-Up Studies; D006801:Humans; D049008:Keratectomy, Subepithelial, Laser-Assisted; D020731:Keratomileusis, Laser In Situ; D054018:Lasers, Excimer; D009216:Myopia / Q000601:surgery*; D010147:Pain Measurement; D010149:Postoperative Pain / Q000175:diagnosis*; D018903:Photorefractive Keratectomy; D011446:Prospective Studies; D012029:Refraction, Ocular; D012720:Severity of Illness Index; D016896:Treatment Outcome; D014792:Visual Acuity