title: Anterior chamber depth measurement before and after photorefractive keratectomy: comparison between IOL master and Orbscan II.
abstract: OBJECTIVE
  To measure the anterior chamber depth (ACD) with 2 different devices before and after photorefractive keratectomy (PRK).
  
  
  METHODS
  Noncomparative case series.
  
  
  METHODS
  One hundred forty-three eyes of 143 patients who had undergone PRK with refractive errors ranging from -13.13 diopters (D) to +7 D (mean, -3.67+/-3.58) were analyzed.
  
  
  METHODS
  The ACD values preoperatively and at 1, 3, and 6 months postoperatively were measured with the Orbscan II and IOL Master. The results were analyzed using the Pearson correlation.
  
  
  METHODS
  Anterior chamber depth.
  
  
  RESULTS
  The instruments showed good agreement between the measurements before and after surgery. A significant decrease between the preoperative and 1-month postoperative measurements was found in the ACD measured from the epithelium with Orbscan II (P<0.01) and IOL Master (P<0.01). A nonsignificant decrease with both IOL Master (P>0.01) and Orbscan II (P>0.01) was found between 3 and 6 months after surgery. The ACD measured from the endothelium using the Orbscan II showed a significant difference only between the 3- and 6-month follow-up data (P<0.01).
  
  
  CONCLUSIONS
  The 2 devices showed good agreement, and the changes detected postoperatively seem to be related not only to corneal thinning but also to anterior segment remodeling.
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: Michele
authors.initials: M
authors.lastname: Lanza
authors.forename: Luigi
authors.initials: L
authors.lastname: Capasso
authors.forename: Marcella
authors.initials: M
authors.lastname: Lucci
authors.forename: Biagio
authors.initials: B
authors.lastname: Polito
authors.forename: Antonio
authors.initials: A
authors.lastname: Romano
mesh_terms: D000293:Adolescent; D000328:Adult; D000867:Anterior Chamber / Q000473:pathology*; D001837:Body Weights and Measures; D003315:Cornea / Q000601:surgery; D003941:Diagnostic Techniques, Ophthalmological / Q000592:standards*; D005260:Female; D006801:Humans; D007368:Interferometry; D054018:Lasers, Excimer; D008027:Light; D008297:Male; D008875:Middle Aged; D018903:Photorefractive Keratectomy; D011182:Postoperative Care; D011300:Preoperative Care; D054140:Refractive Surgical Procedures; D015203:Reproducibility of Results