title: Directionality and alignment of the foveal receptors, assessed with light scattered from the human fundus in vivo.
abstract: The directionality of the foveal receptors of four subjects is assessed with a technique based on light scattering, and a psychophysical technique. The width and orientation of the absorbance diagram (difference between the scattering diagram in a bleached and unbleached state of the visual pigment) are compared with the Stiles-Crawford function. Results show that the directionality in the scattering diagram points into approximately the same direction as the S-C function, but the width of the scattering diagram is slightly less. The alignment of foveal receptors is studied by partially bleaching the retina with oblique incidence from a nasal and temporal direction. Comparison of the absorbance diagrams with a diagram obtained with normal incident bleaching shows no significant shift in their orientations.
mesh_terms: D005584:Fovea Centralis / Q000502:physiology*; D006801:Humans; D008027:Light; D008266:Macula Lutea / Q000502:physiology*; D008297:Male; D010786:Photoreceptor Cells / Q000502:physiology*; D011601:Psychophysics; D012168:Retinal Pigments / Q000502:physiology; D012542:Scattering, Radiation
chemical_list: D012168:Retinal Pigments