title: Reliability of the IOLMaster in measuring corneal power changes after photorefractive keratectomy.
abstract: OBJECTIVE
  To test the accuracy of the IOLMaster (Carl Zeiss) in detecting corneal power changes after photorefractive keratectomy (PRK).
  
  
  METHODS
  Department of Ophthalmology, 2nd University of Naples, Naples, Italy.
  
  
  METHODS
  Two hundred twenty-five consecutive eyes that had PRK (mean -5.13 diopters [D] +/- 2.98 [SD] [range +0.25 to -16.25 D]) were analyzed. The data included preoperative and postoperative (1, 3, and 6 months) subjective refraction and computerized keratometry. Statistical analysis was performed to determine the correlation between the changes in the subjective refraction at the corneal plane and the changes in keratometry.
  
  
  RESULTS
  The mean difference between the changes in refraction and the measured corneal changes was 0.75 +/- 1.13 D (range -3.84 to +7.68 D) at 1 month, 0.92 +/- 1.10 D (range -0.87 to +7.93 D) at 3 months, and 0.75 +/- 0.98 D (range -1.70 to +3.85 D) at 6 months. The difference was significant (P<.001).
  
  
  CONCLUSIONS
  Automated keratometry provided by the IOLMaster did not accurately reflect the effective refractive changes after PRK, particularly in eyes that had a high dioptric treatment.
authors.affiliation: Department of Ophthalmology, 2nd University of Naples, Naples, Italy. nicola.rosa@unina2.it
authors.forename: Nicola
authors.initials: N
authors.lastname: Rosa
authors.forename: Luigi
authors.initials: L
authors.lastname: Capasso
authors.forename: Michele
authors.initials: M
authors.lastname: Lanza
authors.forename: Dario
authors.initials: D
authors.lastname: Furgiuele
authors.forename: Antonio
authors.initials: A
authors.lastname: Romano
mesh_terms: D000328:Adult; D001251:Astigmatism / Q000503:physiopathology* / Q000601:surgery; D003315:Cornea / Q000503:physiopathology* / Q000601:surgery; D005260:Female; D006801:Humans; D007368:Interferometry / Q000295:instrumentation / Q000379:methods; D054018:Lasers, Excimer; D008027:Light; D008297:Male; D008875:Middle Aged; D009216:Myopia / Q000503:physiopathology* / Q000601:surgery; D018903:Photorefractive Keratectomy; D012029:Refraction, Ocular / Q000502:physiology; D015203:Reproducibility of Results; D014792:Visual Acuity / Q000502:physiology