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Diagnosing protan heterozygosity using the Medmont C-100 colour vision test
- Source :
- Clinicalexperimental optometry. 88(4)
- Publication Year :
- 2005
-
Abstract
- 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.
- Subjects :
- Male
Heterozygote
genetic structures
Color Vision Defects
Abnormal colour vision
Optics
medicine
Humans
Color perception test
Genetic Predisposition to Disease
Red light
Color Perception Tests
medicine.diagnostic_test
business.industry
Colour vision test
Genetic Carrier Screening
Colour Vision
Normal colour
Clinical method
Ophthalmology
Optometry
Female
Psychology
business
Subjects
Details
- ISSN :
- 08164622
- Volume :
- 88
- Issue :
- 4
- Database :
- OpenAIRE
- Journal :
- Clinicalexperimental optometry
- Accession number :
- edsair.doi.dedup.....c6401fde43164174ba6a5ead6f887b7d