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Mixture and luminosity data for anomalous trichromats.

G A Fry

    American Journal of Optometry and Physiological Optics
    |January 1, 1984
    PubMed
    Summary
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    This study extends color vision research to anomalous trichromats, revealing distinct red and green response curves. Findings show variations in short-wave red response components for protanomalous and deuteranomalous individuals.

    Area of Science:

    • Color Vision Research
    • Visual Perception Science

    Background:

    • Previous work established methods for deriving red, green, and blue (RGB) response curves from color mixture data.
    • RGB curves were previously derived for dichromats and compared to normal observers.

    Purpose of the Study:

    • To extend the analysis of RGB response curves to anomalous trichromats.
    • To investigate the characteristics of red and green response curves in deuteranomalous and protanomalous vision.

    Main Methods:

    • Utilized a previously established procedure for locating fundamental colors on a color mixture diagram.
    • Derived RGB response curves using mixture data and the luminous efficiency curve.
    • Extended curve derivation to include anomalous trichromats.

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    Main Results:

    • The red response curve in normal, tritanope, and deuteranomalous subjects exhibits two peaks (red and blue ends).
    • The short-wave component of the red response is absent in deuteranopes and the studied protanomalous observer.
    • The long-wave component of the red response in protanomalous vision may be a reduced version of the normal response.
    • The green response in deuteranomalous vision is similar to normal but reduced in magnitude.

    Conclusions:

    • Anomalous trichromacy involves specific alterations in the fundamental color response curves.
    • The red response can be decomposed into long and short-wave components, with variations observed in different types of color vision deficiencies.
    • Further investigation into protanomalous vision suggests a magnitude reduction in the long-wave red response component.