title: Photoastigmatic refractive keratectomy for correction of astigmatism after keratoplasty.
abstract: BACKGROUND
  The efficacy and safety of photoastigmatic refractive keratectomy (PARK) to correct astigmatism after keratoplasty was evaluated.
  
  
  METHODS
  PARK was performed using the Nidek EC-5000 excimer laser in 10 eyes of 10 patients (mean age: 49.5 +/- 11.5 years) with astigmatism after keratoplasty.
  
  
  RESULTS
  The refractive cylinder decreased from 5.80 to 3.20 D, whereas at 6 months, topographic cylinder decreased from 7.40 to 5.90 D post-operatively. Five eyes (50%) had uncorrected visual acuity of 20/60 or better at 3 months. Stromal haze increased from 3 to 6 months postoperatively, and at 6 months, 5 eyes (50%) had a haze score of greater than or equal to 2.0.
  
  
  CONCLUSIONS
  PARK is a moderately effective method of correcting astigmatism after keratoplasty.
authors: L.V. Prasad Eye Institute, Hyderabad, India. akb@lvpeye.stph.net
authors: A K
authors: AK
authors: Bansal
mesh_terms: D001251:Astigmatism / Q000209:etiology / Q000473:pathology / Q000601:surgery*; D003318:Corneal Opacity / Q000209:etiology / Q000473:pathology; D003319:Corneal Stroma / Q000473:pathology; D019781:Corneal Topography; D005139:Eyeglasses; D005500:Follow-Up Studies; D006801:Humans; D015948:Keratoplasty, Penetrating / Q000009:adverse effects*; D054018:Lasers, Excimer; D008875:Middle Aged; D018903:Photorefractive Keratectomy; D012029:Refraction, Ocular; D012086:Reoperation; D016896:Treatment Outcome; D014792:Visual Acuity