title: Assessment of anterior chamber angle using Visante OCT, slit-lamp OCT, and Pentacam.
abstract: OBJECTIVE
  To assess and compare the anterior chamber angle (ACA) by different anterior segment imaging techniques.
  
  
  METHODS
  Forty healthy eyes of 40 normal subjects were recruited and 3 consecutive measurements of ACA were determined prospectively utilizing Visante optical coherence tomography (OCT), slit-lamp OCT (SL-OCT), and Pentacam. Statistical significance of interdevice differences between measurements was evaluated by Wilcoxon signed rank test and Bland-Altman analysis. The repeatability of 3 consecutive measurements was analyzed by repeated measured analysis of variance.
  
  
  RESULTS
  Mean nasal and temporal ACA were detected as 31.2+/-8.7 and 32.1+/-8.5 degrees by Visante OCT; 41.6+/-5.9 and 41.8+/-5.2 degrees by Pentacam; and 42.9+/-10.0 and 43.3+/-10.1 degrees by SL-OCT. All devices displayed a high intrasession repeatability (Scheffe multiple comparison, p>0.05). ACA detected by Visante OCT were found significantly different from ACA calculated by Pentacam and SL-OCT (p<0.05). On the other hand, ACA data obtained by Pentacam and SL-OCT were found to be statistically similar (p>0.05).
  
  
  CONCLUSIONS
  Although noncontact ACA measurements using all modalities were easy to handle and demonstrated good repeatability in healthy participants, the tested devices were not regarded as comparable. Hence, the clinician should take the different modalities into consideration during ACA assessment using various devices.
authors.affiliation: Yeditepe University Eye Hospital, Ophthalmology Department, Istanbul - Turkey. umutdinc@yahoo.com
authors.forename: Umut Ali
authors.initials: UA
authors.lastname: Dinc
authors.forename: Banu
authors.initials: B
authors.lastname: Oncel
authors.forename: Ebru
authors.initials: E
authors.lastname: Gorgun
authors.forename: Ilgaz S
authors.initials: IS
authors.lastname: Yalvac
mesh_terms: D000328:Adult; D000867:Anterior Chamber / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D008297:Male; D016011:Normal Distribution; D010781:Photography / Q000379:methods*; D011446:Prospective Studies; D015203:Reproducibility of Results; D041623:Tomography, Optical Coherence / Q000379:methods*; D055815:Young Adult