title: Measurement of ultrasound biomicroscopy images: intraobserver and interobserver reliability.
abstract: OBJECTIVE
  To evaluate intraobserver and interobserver reproducibility of measurement of images obtained during ultrasound biomicroscopy.
  
  
  METHODS
  Four anterior segment images of four normal patients were obtained by a single examiner. The measurements of three independent observers were compared to assess interobserver reproducibility in quantifying the images. Thirteen different anterior segment parameters were measured by each observer on each image. Intraobserver and interobserver reproducibility of measurement were assessed by calculating the coefficient of variation for each individual observer and by using the F test to detect a difference among observers.
  
  
  RESULTS
  Intraobserver reproducibility was high. Interobserver reproducibility for the measured parameters varied considerably and was affected by subjective interpretation of visualized anatomic landmarks.
  
  
  CONCLUSIONS
  The optimal parameters for quantitative ultrasound biomicroscopy require refinement. Measurements of alterable parameters are best measured presently by a single observer. Ultrasound biomicroscopy has the potential to elucidate anatomic relationships underlying much anterior segment disease, but caution in interpreting quantitative differences is warranted.
authors.affiliation: Department of Ophthalmology, New York Eye and Ear Infirmary, New York 10003.
authors.forename: C
authors.initials: C
authors.lastname: Tello
authors.forename: J
authors.initials: J
authors.lastname: Liebmann
authors.forename: S D
authors.initials: SD
authors.lastname: Potash
authors.forename: H
authors.initials: H
authors.lastname: Cohen
authors.forename: R
authors.initials: R
authors.lastname: Ritch
mesh_terms: D000869:Anterior Eye Segment / Q000000981:diagnostic imaging*; D000886:Anthropometry; D006801:Humans; D008853:Microscopy; D015588:Observer Variation; D015203:Reproducibility of Results; D014463:Ultrasonography