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Polymorphism in normal human color vision and its mechanism
1Department of Psychology, University of California, Santa Barbara 93106.
Vision Research
|January 1, 1990
Summary
Color vision in males with normal sight varies due to differences in cone pigments. Most individuals possess more than three types of cone pigments, impacting spectral positioning.
Area of Science:
- Vision Science
- Genetics
- Molecular Biology
Background:
- Human color vision relies on cone photoreceptors with specific spectral sensitivities.
- Previous research suggested X-linked genetic variations influence cone pigment spectral positioning in normal color vision.
Purpose of the Study:
- To distinguish individual differences in cone pigment spectral positioning from other color vision variations.
- To investigate the diversity of cone pigment types in color normal individuals.
Main Methods:
- Obtained two distinct color matches (Rayleigh matches) from 60 color normal males.
- Compared color matching data to analyze variations in spectral positioning of middle and long wavelength cone pigments.
Main Results:
- Identified discrete variations in both middle and long wavelength cone pigments among color normal males.
- Demonstrated that most individuals possess more than three distinct cone pigment types.
Conclusions:
- Discrete genetic variations in cone pigments are common in the human population.
- The human visual system exhibits greater complexity than previously assumed, with multiple cone pigment types contributing to normal color vision.