title: Comparison of advanced visual field defects measured with the Tübingen Mobile Campimeter and the Octopus 101 perimeter.
abstract: OBJECTIVE
  To compare the results of advanced visual field defects (VFD) measured with the conventional reference perimeter Octopus 101 (O-101) and the new portable Tübingen Mobile Campimeter (TMC).
  
  
  METHODS
  Thirty-seven subjects (18 to 75 years), 13 with advanced arcuate scotomas, 12 with VFD respecting vertical meridians, 6 with concentric constriction and 6 healthy controls were included. First examination was with O-101: grid 30 degrees -NO, 192 stimuli, 10 cd/m(2) background luminance, stimulus size: Goldmann III (26'); second examination was with TMC: 84 stimuli (subset of grid 30 degrees -NO), stimulus size 34', stimulus luminance 320-370 cd/m(2), background luminance 8-20 cd/m(2). Pointwise accuracy (proportion of concordant locations), sensitivity, and specificity were estimated into 95% confidence intervals (CI) by averaging individual logits. Examination durations were compared.
  
  
  RESULTS
  TMC results are highly concordant with O-101 results for all defect classes. For the entire sample, the percentage of discordant points (perceived with TMC but not with O-101) among all discordant points was 35% (CI: 30% to 40%). Analyzed by VFD pattern, accuracy was highest in healthy controls scotomas (97.9%; CI: 97% to 98.5%) and lowest in arcuate scotomas (80.6 %; CI: 77.3% to 83.5%). Sensitivity was highest in concentric constriction (94.5%; CI: 82.9% to 98.4%) and lowest in healthy controls (59.1%; CI: 26.3% to 85.3%). Specificity was highest in healthy controls (98.1%; CI: 96.6% to 98.9%) and lowest in concentric constriction (77.4%; CI: 62.1% to 87.7%). Mean examination time was 4.6 minutes (TMC) and 9.8 minutes (O-101).
  
  
  CONCLUSIONS
  The results indicate that the TMC is a feasible device for detection of VFD.
authors.affiliation: Centre for Ophthalmology, Institute for Ophthalmic Research, University of Tübingen, Germany.
authors.forename: Anna
authors.initials: A
authors.lastname: Bruckmann
authors.forename: Nicholas J
authors.initials: NJ
authors.lastname: Volpe
authors.forename: Jens
authors.initials: J
authors.lastname: Paetzold
authors.forename: Reinhard
authors.initials: R
authors.lastname: Vonthein
authors.forename: Ulrich
authors.initials: U
authors.lastname: Schiefer
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012607:Scotoma / Q000175:diagnosis*; D012680:Sensitivity and Specificity; D058609:Visual Field Tests / Q000295:instrumentation* / Q000379:methods; D014794:Visual Fields; D055815:Young Adult