title: Three-dimensional analysis of measurements of the Heidelberg Retina Tomograph.
abstract: BACKGROUND
  With the aid of scanning laser tomography, feasible with the Heidelberg Retina Tomograph (HRT), refined structures can be measured three-dimensionally. Pictures are built up from scanned layers which are represented as two-dimensional topographical or reflectivity pictures by the HRT software. The kind of information that is provided by the third dimension can be exploited much better by real spatial three-dimensional presentation. The autostereoscopic Dresden 3D display makes such a spatial presentation feasible as add-on to the HRT.
  
  
  METHODS
  Seventeen patients (9 women, 8 men) were chosen on the basis of a long duration of observation (mean 42.41 months) and a large number of follow-up examinations (mean 5.29). These patients were examined with the HRT as well as with the Dresden 3D display. The results were compared regarding their correlation pairs.
  
  
  RESULTS
  Comparing the correlation pairs (r>0.7) the Dresden 3D display provided a higher Pearson correlation coefficient with 8 out of 10 pairs. It was evident that the evaluations of the two devices referred to the same parallel structures.
  
  
  CONCLUSIONS
  The Dresden 3D display facilitates, with its form of presentation, a better evaluation of the measurements of the HRT. More precise evaluation of retinal structures by virtue of the autostereoscopic display presents an improvement.
authors.affiliation: Augenklinik und Poliklinik der Universität des Saarlandes, Homburg, Germany.
authors.forename: U D
authors.initials: UD
authors.lastname: Müller-Richter
authors.forename: H J
authors.initials: HJ
authors.lastname: Malig
authors.forename: A
authors.initials: A
authors.lastname: Schwerdtner
authors.forename: M
authors.initials: M
authors.lastname: Lang
authors.forename: K
authors.initials: K
authors.lastname: Hille
authors.forename: K W
authors.initials: KW
authors.lastname: Ruprecht
mesh_terms: D005240:Feasibility Studies; D005260:Female; D005901:Glaucoma / Q000473:pathology*; D006801:Humans; D007834:Lasers; D008297:Male; D015588:Observer Variation; D009898:Optic Disk / Q000473:pathology; D015203:Reproducibility of Results; D012160:Retina / Q000473:pathology*; D012720:Severity of Illness Index; D012984:Software; D014054:Tomography / Q000379:methods*