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Mesopic luminous-efficiency functions for various adapting levels.

H Yaguchi, M Ikeda

    Journal of the Optical Society of America. A, Optics and Image Science
    |January 1, 1984
    PubMed
    Summary
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    This study measured luminous-efficiency functions using heterochromatic brightness matching. Results show that high adapting light levels or test field luminance consistently yield photopic vision, indicating cone dominance.

    Area of Science:

    • Vision Science
    • Photometry
    • Human Physiology

    Background:

    • Understanding luminous-efficiency functions is crucial for visual perception research.
    • Investigating the roles of rods and cones in brightness sensation requires controlled experimental conditions.
    • Previous models like the Ikeda-Shimozono formula aid in analyzing visual responses.

    Purpose of the Study:

    • To measure luminous-efficiency functions under varying retinal illuminance and adapting light levels.
    • To determine the conditions under which rod and cone contributions shift in brightness perception.
    • To analyze the obtained luminous-efficiency curves using the Ikeda-Shimozono formula.

    Main Methods:

    • Heterochromatic brightness matching was employed for a centrally viewed 10-degree field.

    Related Experiment Videos

  • Subjects were exposed to a 45-degree white adapting light, with brief substitutions for the test field.
  • Luminous-efficiency curves from two subjects were analyzed using the Ikeda-Shimozono formula.

    • Main Results:

    • Photopic luminous-efficiency functions were observed when the adapting light exceeded approximately 100 trolands (Td).
    • Similarly, photopic functions were evident when the test field luminance reached 100 Td, regardless of adapting level.
    • These findings suggest a transition towards cone-dominant vision under specific luminance conditions.

    Conclusions:

    • High adapting light levels (above 100 Td) drive the visual system towards photopic function.
    • A test field luminance of 100 Td also results in photopic vision, irrespective of the adapting light.
    • The study confirms the significant influence of luminance on the interplay between rods and cones in brightness perception.