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Counterphase modulation flicker photometry: phenotypic and genotypic associations.

A J Lawrance-Owen, J M Bosten, R E Hogg

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    |April 4, 2014
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    Summary
    This summary is machine-generated.

    The OSCAR test measures cone photoreceptors. A genetic marker near the RXRG gene is linked to variations in human color vision, impacting cone development and opsin gene expression.

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    Area of Science:

    • Ophthalmology
    • Genetics
    • Visual Perception

    Background:

    • The OSCAR test uses counterphase flicker photometry to assess retinal cone photoreceptors.
    • It is sensitive to the relative numbers of long- and middle-wavelength cones and individual photopigment variations.

    Purpose of the Study:

    • To investigate population-level variations in perception using the OSCAR test.
    • To explore the genetic underpinnings of individual differences in color vision.

    Main Methods:

    • Collected OSCAR settings from 1058 participants.
    • Assessed test-retest reliability (Spearman's rho = 0.80) in a subset.
    • Conducted a whole-genome association study.

    Main Results:

    • Reported distribution characteristics of OSCAR settings in the cohort.
    • Identified a provisional association with single nucleotide polymorphism rs16844995.
    • This marker is located near the RXRG gene.

    Conclusions:

    • RXRG plays a role in cone differentiation during eye development.
    • Polymorphisms in or near RXRG may influence the expression of long- and middle-wave opsin genes in human cones.
    • This suggests a genetic basis for individual differences in color perception.