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.


METHODS
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.


CONCLUSIONS
We conclude that the Medmont C-100 can be used clinically to diagnose carriers of protan colour vision deficiency.
Harris
Ross W
RW
Department of Optometry and Vision Sciences, The University of Melbourne, 374 Cardigan Street, Carlton, VIC 3053, Australia.
Cole
Barry L
BL
D003119:Color Perception Tests / Q000379:methods*; D003117:Color Vision Defects / Q000175:diagnosis* / Q000235:genetics*; D005260:Female; D006580:Genetic Carrier Screening / Q000379:methods*; D020022:Genetic Predisposition to Disease; D006579:Heterozygote; D006801:Humans; D008297:Male