title: Reproducibility of optic disk topographic measurements with the Topcon ImageNet and the Heidelberg Retina Tomograph.
abstract: OBJECTIVE
  To compare the reproducibility of optic disk measurements provided by an image analyzer and a scanning laser tomograph.
  
  
  METHODS
  Ten images of the same eye of 10 normal volunteers were taken with the Heidelberg Retina Tomograph and with the Topcon ImageNet. Intraclass correlation coefficient (ICC) and coefficient of variation (CV) were used to evaluate the reproducibility of the measurements.
  
  
  RESULTS
  Eleven parameters were analyzed with the Topcon ImageNet. Six parameters (55%) had ICC greater than 90%. Four parameters (36%) had CV less than 10%. Twelve parameters were evaluated with the Heidelberg Retina Tomograph. Nine parameters (75%) had ICC over 90%. Nine parameters (75%) had CV less than 10%.
  
  
  CONCLUSIONS
  Both systems provided reproducible data. The optic disk parameters provided by the Heidelberg Retina Tomograph had a better reproducibility than those obtained from the Topcon ImageNet.
authors.affiliation: Department of Ophthalmology, Indiana University, School of Medicine, Indianapolis, USA.
authors.forename: A
authors.initials: A
authors.lastname: Azuara-Blanco
authors.forename: A
authors.initials: A
authors.lastname: Harris
authors.forename: L B
authors.initials: LB
authors.lastname: Cantor
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007834:Lasers; D008297:Male; D015588:Observer Variation; D009898:Optic Disk / Q000033:anatomy & histology*; D011897:Random Allocation; D012016:Reference Values; D015203:Reproducibility of Results; D012160:Retina / Q000033:anatomy & histology; D014054:Tomography / Q000295:instrumentation*