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Repeatability of the C-100 colour vision test
1School of Optometry, University of Waterloo, Waterloo, Ontario, Canada.
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.
Conclusion:
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.
