title: Photorefractive keratectomy for myopia with a 15 Hz repetition rate.
abstract: OBJECTIVE
  To evaluate excimer laser photorefractive keratectomy (PRK) for myopia using a repetition rate of 15 Hz instead of 10 Hz.
  
  
  METHODS
  The Cornea and Laser Eye Institute, Teaneck, and Department of Ophthalmology, UMDNJ-New Jersey Medical School, Newark, New Jersey, USA.
  
  
  METHODS
  Photorefractive keratectomy using a 15 Hz repetition rate was performed in 23 eyes of 14 patients by a single surgeon at 1 center. The attempted corrections ranged from -2.8 diopters (D) to -5.5 D. Preoperative and postoperative uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BSCVA), predictability, corneal haze, and subjective glare/halo were evaluated over 6 months.
  
  
  RESULTS
  At 6 months, UCVA was 20/32 or better in all eyes and at least 20/20 in 14 eyes (73.7%). Two eyes (10.5%) lost 2 or more Snellen lines of BSCVA; postoperative BSCVA was at least 20/25 in 100% of eyes and 20/20 or better in 95.0%. Fifteen eyes (78.9%) were within +/-0.5 D of attempted correction, and 19 (100%) were within +/-1.0 D. Mean spherical equivalent refraction was -4.62 D preoperatively, +0.15 D at 1 month, -0.09 D at 3 months, and -0.37 D at 6 months. At 6 months, 4 eyes (21.0%) had no corneal haze and 14 (73.7%) had trace subepithelial haze. Fifteen eyes (78.9%) had no glare/halo effect at 6 months, and 4 (21.0%) had minimal glare/halo effect.
  
  
  CONCLUSIONS
  Clinical outcomes after excimer laser PRK for myopia using an increased repetition rate of 15 Hz were good and similar to those in studies conducted with a 10 Hz repetition rate.
authors.affiliation: Department of Ophthalmology, UMDNJ-New Jersey Medical School, Newark, New Jersey 07103-2499, USA.
authors.forename: E M
authors.initials: EM
authors.lastname: Fisher
authors.forename: N E
authors.initials: NE
authors.lastname: Ginsberg
authors.forename: K S
authors.initials: KS
authors.lastname: Scher
authors.forename: P S
authors.initials: PS
authors.lastname: Hersh
mesh_terms: D000328:Adult; D003315:Cornea / Q000601:surgery*; D019466:Glare; D006801:Humans; D054018:Lasers, Excimer; D008875:Middle Aged; D009216:Myopia / Q000601:surgery*; D018903:Photorefractive Keratectomy / Q000379:methods*; D012029:Refraction, Ocular; D016896:Treatment Outcome; D014792:Visual Acuity