title: Intraobserver and interobserver agreement in evaluating the anterior chamber angle configuration by ultrasound biomicroscopy.
abstract: OBJECTIVE
  To determine the intra- and interobserver agreement in assessing the configuration of the human anterior chamber angle using ultrasound biomicroscopy (UBM).
  
  
  METHODS
  Two masked clinicians used ubm images to estimate, in 41 eyes, (a) the position of contact between the peripheral iris and the inside of the eye wall, (b) the angular size of the anterior chamber angle (ACA), and (c) the curvature of the peripheral iris. Both observers, masked to the previous results, examined the same images in a second session. Agreement was evaluated using the unweighted kappa statistic.
  
  
  RESULTS
  Intraobserver agreement in assessing the iris insertion, angular width, and the iris curvature was high (range of kappa values, 0.83-0.92). Interobserver agreement in evaluating the level of iris insertion (kappa = 0.79), the angular width (kappa = 0.95), and the iris curvature (kappa = 0.84) was also high.
  
  
  CONCLUSIONS
  The agreement within the same observer and between observers in evaluating the ACA configuration by UBM was excellent.
authors.affiliation: Glaucoma Service, Wills Eye Hospital, Thomas Jefferson University, Philadelphia, PA 19107, USA.
authors.forename: G L
authors.initials: GL
authors.lastname: Spaeth
authors.forename: A
authors.initials: A
authors.lastname: Azuara-Blanco
authors.forename: S V
authors.initials: SV
authors.lastname: Araujo
authors.forename: J J
authors.initials: JJ
authors.lastname: Augsburger
mesh_terms: D000867:Anterior Chamber / Q000000981:diagnostic imaging*; D005069:Evaluation Studies as Topic; D005901:Glaucoma / Q000000981:diagnostic imaging*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007498:Iris / Q000000981:diagnostic imaging*; D015588:Observer Variation; D015203:Reproducibility of Results; D014463:Ultrasonography