✦ LIBER ✦

A redesigned Farnsworth dichotomous B20 test

✍ Scribed by Jennifer Birch; Paul Chamberlain; Fatma A. Sheriff

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 75 KB
Volume: 26
Category: Article
ISSN: 0361-2317
DOI: 10.1002/1520-6378(2001)26:1+<::aid-col53>3.0.co;2-f

No coin nor oath required. For personal study only.

✦ Synopsis

The Farnsworth dichotomous B20 test has been reconstructed using a circle of Munsell Hues with value 5: 7 hues have chroma 4, and 13 hues have chroma 2. Results were obtained for 46 normal subjects, 36 subjects with red-green colour deficiency, and 1 congenital tritanope. A larger number of deuteranomalous trichromats fail the reconstructed B20 than fail the Farnsworth D15 test. The B20 test gives good protan/deutan classification, when the test is failed, and provides significantly more isochromatic colour confusions for identifying and classifying tritanopia and tritan colour deficiency than the D15 test.

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