title: [Age-dependent error rates in automatic screen campimetry with bright and dark stimuli].
abstract: OBJECTIVE
  To assess patient reliability and compliance, most perimeters check for false-positive and -negative answers. In this study the results of catch trials were obtained with video campimetry with respect to age-related changes and differences for tests using increment and decrement stimuli.
  
  
  METHODS
  Sixty-one ophthalmologically normal persons (aged 20-80 years) were tested with automated campimetry on a computer screen. Examination strategy included bright and dark 1 degree-stimuli at 69 test locations within the central 30 degrees of the visual field (presented on a computer screen). Four percent of all stimulus presentations were used for testing false-positive answers, 4% for false-negative answers.
  
  
  RESULTS
  The rate of false-positive answers was not significantly age-related and there was no difference for tests with dark and bright stimuli. Concerning false-negative answers, no difference between dark and bright stimuli was found. There was also no strong correlation with age.
  
  
  CONCLUSIONS
  In this study rates of false-positive and -negative answers were low at a comparable level for either stimulus type (bright/dark) or age of the tested persons.
authors.affiliation: Universitäts-Augenklinik Heidelberg.
authors.forename: B
authors.initials: B
authors.lastname: Wabbels
authors.forename: U
authors.initials: U
authors.lastname: Schiefer
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D003936:Diagnosis, Computer-Assisted / Q000295:instrumentation*; D005260:Female; D006801:Humans; D008297:Male; D008838:Microcomputers; D008875:Middle Aged; D010349:Patient Compliance; D010775:Photic Stimulation; D011237:Predictive Value of Tests; D058609:Visual Field Tests / Q000295:instrumentation*; D014794:Visual Fields / Q000502:physiology*