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  • Title: Spatial-frequency response of a photoreceptor and its wavelength dependence. I. Coherent sources.
    Author: Stacey A, Pask C.
    Journal: J Opt Soc Am A Opt Image Sci Vis; 1994 Apr; 11(4):1193-8. PubMed ID: 8189282.
    Abstract:
    The response of an isolated model foveal cone to a coherent sinusoidal intensity source is explored with use of the methods of photoreceptor optics. The dielectric waveguide model of a foveal cone that was previously used to explain the Stiles-Crawford effect and its wavelength dependence [Vision Res. 13, 1115 (1973)] is applied to photoreceptor excitation by coherent gratings with variable spatial frequency and light wavelength. The results indicate that the photoreceptors themselves contribute to visual acuity through a wavelength-dependent response at each spatial frequency. In particular, the isolated photoreceptor has a characteristic low-pass spatial-frequency-filter effect for wavelengths between 410 and 654 nm (where two waveguide modes are carried) and a flat response for wavelengths greater than 654 nm (the single-mode region).
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