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UV–Vis Spectrum01:30

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When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
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Related Experiment Video

Updated: Jul 5, 2026

Determination of Photoreceptor Cell Spectral Sensitivity in an Insect Model from In Vivo Intracellular Recordings
08:33

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Published on: February 26, 2016

Mesopic luminous-efficiency functions

M Ikeda, H Shimozono

    Journal of the Optical Society of America
    |March 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    This study defines the luminous-efficiency function for mesopic vision. A new formula combines scotopic and photopic vision sensitivities, applicable across various luminance levels.

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    Area of Science:

    • Vision Science
    • Photometry

    Background:

    • Mesopic vision, the intermediate state between scotopic (low light) and photopic (bright light) vision, has a complex luminous-efficiency function.
    • Understanding this function is crucial for accurate light measurement and visual perception research.

    Purpose of the Study:

    • To establish the luminous-efficiency function for the standard observer under mesopic vision conditions.
    • To develop a simple mathematical model for mesopic luminous efficiency.

    Main Methods:

    • Direct heterochromatic brightness-matching method was employed.
    • Measurements were taken across a wide range of retinal illuminance (-2 to 2 log photopic trolands).
    • A 10-degree steady visual field presented foveally was used.

    Main Results:

    • Luminous efficiency functions showed a transition from rod-dominant (scotopic-like) to cone-dominant (photopic-like) shapes.
    • A novel formula was derived by linearly adding log sensitivities of scotopic and photopic vision, weighted by luminance-dependent coefficients.
    • Saturation functions remained consistent across luminance levels, suggesting sustained chromatic channel contributions.

    Conclusions:

    • The derived formula accurately represents mesopic luminous-efficiency functions.
    • Chromatic channels contribute to brightness sensation even at low retinal illuminations.
    • This research provides a standardized model for mesopic vision's luminous efficiency.