title: Repeatability of the C-100 colour vision test.
abstract: BACKGROUND
  The C-100 colour vision test has been shown to have a high validity for diagnosing the type of red-green colour vision defect, however, there is little information on the repeatability of the test. This study examines the repeatability of the C-100 in classifying the colour vision defect as either protan or deutan.
  
  
  METHODS
  The C-100 was administered on two occasions to 58 subjects with congenital red-green colour vision defects. The sessions were separated by a minimum period of 10 days.
  
  
  RESULTS
  The repeatability of the C-100 was high with a kappa coefficient of agreement for diagnosis of 0.96. The few discrepancies were misclassifying protans as deutans.
  
  
  CONCLUSIONS
  The C-100 is a highly repeatable test in terms of separating protans from deutans. However, if a discrepancy occurs, it is more likely to be a protan misclassified as a deutan rather than vice versa.
authors.affiliation: School of Optometry, University of Waterloo, Waterloo, Ontario, Canada.
authors.forename: Jeffery K
authors.initials: JK
authors.lastname: Hovis
mesh_terms: D000328:Adult; D003119:Color Perception Tests / Q000592:standards*; D003117:Color Vision Defects / Q000151:congenital / Q000175:diagnosis*; D006801:Humans; D008875:Middle Aged; D015203:Reproducibility of Results