The Roth 28-hue test assesses color vision deficits, suggesting it may balance accuracy and simplicity.
The Roth 28‐hue test, first described in 1966, uses every third color cap from the Farnsworth‐Munsell 100‐hue (85‐color‐cap) test. Protans, deutans, and tritans exhibit slightly different confusion axes on the Roth 28‐hue test and the Farnsworth D‐15 test. These axes are illustrated on a CIE chromaticity diagram. The little‐used Roth 28‐hue test may be a good compromise between the D‐15 and 100‐hue tests, but clinical trials for verification are needed.
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Amos et al. (1977) studied this question.
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