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Wavelength dependence of reflectometric cone photoreceptor directionality

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Author: Zagers, N.P.A. · Berendschot, T.T.J.M. · Norren, D. van
Type:article
Date:2003
Source:Journal of the Optical Society of America A, 1, 20, 18 - 23
Identifier: 12702
doi: doi:10.1364/JOSAA.20.000018
Keywords: Vision · Aberrations · Data reduction · Light scattering · Optical waveguides · Signal to noise ratio · Photoreceptors · Light reflection · Physiology · Psychophysics · Pupil · Radiation exposure · Radiation scattering · Retina cone · Cones (Retina) · Humans · Light · Models, Biological · Scattering, Radiation

Abstract

We present evidence for the wavelength dependence of the directionality of light reflected from cone receptor cells (optical StilesCrawford effect): Blue light is more directional than red. According to the waveguide-scattering model of Marcos J. Opt. Soc. Am. A 15 , 2012 (1998), directionality is the sum of a waveguide component and a scattering component. The latter is proportional to 1 over wavelength squared, and it is related to the row-to-row spacing of the cone lattice. Our results allow a firm confirmation of Marcos s theory. For a 1.9-deg foveal area, group mean (n=18) cone spacing was 3.42 m, in good agreement with anatomical data. Group mean waveguide directionality was 0.077 mm 2