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Repeatability indices for the Farnsworth D-15 test

Published online by Cambridge University Press:  05 April 2005

JEFFERY K. HOVIS ,
SHANKARAN RAMASWAMY  and
MATTHEW ANDERSON
JEFFERY K. HOVIS
Affiliation:
School of Optometry, University of Waterloo, Waterloo, Ontario, Canada
SHANKARAN RAMASWAMY
Affiliation:
School of Optometry, University of Waterloo, Waterloo, Ontario, Canada
MATTHEW ANDERSON
Affiliation:
School of Optometry, University of Waterloo, Waterloo, Ontario, Canada
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Abstract

The repeatability of the D-15 color-vision test is considered to be excellent. However, this conclusion is based on a subject pool which contained a large percentage of color-normals. This type of sampling could bias the repeatability results because color-normals rarely fail the test. Furthermore, color-normals usually do not perform the D-15 in the clinical setting. To establish the repeatability of the D-15 for a relevant clinical population, we examined the D-15 results from two different sessions for 116 subjects who had a congenital red–green color-vision defect. The kappa coefficient for intersession agreement indicated that approximately 84% of the subjects obtained the same pass/fail results at both sessions. The type of defect was repeatable on approximately 80% of the subjects. Although the repeatability of the D-15 for color-defective subjects was good, it was lower than the near-perfect agreement reported previously. The coefficients of repeatability for the crossings show that if a person makes less than five crossings then the test should be administered again in order to ensure that the test result is repeatable.

Keywords

Farnsworth D-15RepeatabilityScoringColor-vision testing

Information

Type
Research Article
Information
Visual Neuroscience , Volume 21 , Issue 3 , May 2004 , pp. 449 - 453
Copyright
© 2004 Cambridge University Press

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