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PubMed · 3838378

A BASIC computer program for analysis of the Farnsworth 100-hue test.

M J Crabbe·L S Mengher
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Abstract

A computer program in BASIC has been written which will compute all scores for the Farnsworth 100-hue test, and plot them in the appropriate colour on a polar co-ordinate graph. Hard copy can be obtained on a dot-matrix printer. The program is simple to use, and considerably curtails the analysis time for this test, as well as eliminating possible computational errors.

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Color Perception TestsComputersHumansSoftwareJournal ArticleResearch Support, Non-U.S. Gov'tResearch Support, U.S. Gov't, P.H.S.

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M J Crabbe, L S Mengher. 1985. A BASIC computer program for analysis of the Farnsworth 100-hue test.. https://pubmed.ncbi.nlm.nih.gov/3838378/

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PubMed2005

Diagnosing protan heterozygosity using the Medmont C-100 colour vision test.

BACKGROUND: A surprisingly high 15 per cent of women in Caucasian societies are carriers of the genes for abnormal colour vision but there is no clinical method to identify them. It has long been known that heterozygotes for the protan colour vision deficiencies can demonstrate a reduced luminous sensitivity to red light. This is known as Schmidt's sign, which is thought to arise from mosaicism (Lyonisation). The Medmont C-100 colour vision test measures relative spectral sensitivity using flicker photometry to differentiate protans and deutans. It should be able to diagnose Schmidt's sign. METHOD: We tested six known protan heterozygotes (four whose sons have a protan colour vision deficiency and two whose fathers are protan) with the Medmont C-100 test. RESULTS: All six heterozygotes made average settings of -1.75 or more negative at the Medmont C-100 test, settings which are at or beyond the boundary of the distribution of settings made by observers with normal colour vision. There have been two previous cases reported in the literature of protan heterozygotes, who made protan settings on the Medmont C-100 or its predecessor test, the OSCAR. We also tested six daughters of the known heterozygotes, 50 per cent of whom are likely to be heterozygotes. Four of the six (66 per cent) made protan settings on the Medmont C-100. The other two made normal 0.0 settings. CONCLUSION: We conclude that the Medmont C-100 can be used clinically to diagnose carriers of protan colour vision deficiency.

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