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Related Experiment Video

Updated: Mar 18, 2026

Retinal Pigment Epithelium Transplantation in a Non-human Primate Model for Degenerative Retinal Diseases
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Small field tritanopia in the peripheral retina.

Vicki J Volbrecht

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |July 14, 2016
    PubMed
    Summary

    Small field tritanopia, a loss in green hue perception with small stimuli, is influenced by rod input in the peripheral retina. Maximizing rod contribution requires larger stimuli to elicit this effect compared to minimizing rod input.

    Area of Science:

    • Visual neuroscience
    • Color vision research

    Background:

    • Small stimuli can reduce hue perception, particularly green, in both central and peripheral vision, an effect known as small field tritanopia.
    • The influence of rod photoreceptors on the dynamics of small field tritanopia in the peripheral retina remains unclear.

    Purpose of the Study:

    • To investigate how rod input affects small field tritanopia in the peripheral retina.
    • To compare hue perception under conditions that minimize versus maximize rod contribution.

    Main Methods:

    • Peripheral hue-naming data were collected using small stimuli at mesopic and photopic illuminances.
    • Experiments were conducted under conditions designed to minimize (bleach) and maximize (no bleach) rod contribution.

    Main Results:

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    • Attenuation of green perception occurred with larger stimuli in the no-bleach condition than in the bleach condition.
    • Increasing retinal illuminance decreased the stimulus size for small field tritanopia, but larger stimuli were still needed in the no-bleach condition.
    • Differences in stimulus size were linked to rod input influencing magnocellular and koniocellular pathways, weakening chromatic signals.

    Conclusions:

    • Small field tritanopia, potentially involving short-wavelength-sensitive (S) cone activity, is modulated by rod input in the peripheral retina.
    • Rod input can alter the stimulus size required for small field tritanopia, suggesting a role in modulating chromatic signal strength and green perception.