title: Photorefractive keratectomy for residual myopia after radial keratotomy.
abstract: OBJECTIVE
  To evaluate the results of photorefractive keratectomy (PRK) to treat undercorrected radial keratotomy (RK).
  
  
  METHODS
  Instituto de Oftalmologia Tadeu Cvintal, São Paulo, Brazil.
  
  
  METHODS
  A consecutive series of 28 eyes that had PRK to treat residual myopia after RK were studied. Refractive visual and safety data were collected and evaluated.
  
  
  RESULTS
  One year after PRK, 75% of eyes had an uncorrected visual acuity of 20/25 or better and 85%, 20/40 or better. All but one case maintained or improved best corrected visual acuity; one case decreased from 20/25 to 20/30. At 1 year, 75% of eyes were within 0.50 diopter (D) of emmetropia and 90% were within 1.00 D. Only one case was more than 1.00 D undercorrected (-1.125 D) at 1 year. Mean pre-RK myopia was -5.90 D (range -2.00 to 11.80 D). Mean spherical equivalent improved from the residual postoperative level of -2.71 D +/- 0.86 (SD) before PRK to -0.21 +/- 0.86 D 1 to 3 months after PRK and to -0.40 +/- 0.43 D 1 year after PRK.
  
  
  CONCLUSIONS
  Photorefractive keratectomy was efficacious in correcting residual myopia after RK in a group of selected patients.
authors.affiliation: John-Kenyon Eye Research Foundation, Jeffersonville, Indiana 47130, USA.
authors.forename: M E
authors.initials: ME
authors.lastname: John
authors.forename: E
authors.initials: E
authors.lastname: Martines
authors.forename: T
authors.initials: T
authors.lastname: Cvintal
mesh_terms: D015331:Cohort Studies; D003315:Cornea / Q000601:surgery*; D005500:Follow-Up Studies; D006801:Humans; D007646:Keratotomy, Radial / Q000009:adverse effects*; D054018:Lasers, Excimer; D009216:Myopia / Q000209:etiology / Q000601:surgery*; D018903:Photorefractive Keratectomy; D011183:Postoperative Complications; D012086:Reoperation; D016896:Treatment Outcome; D014792:Visual Acuity