Wavelength dependence of the Stiles-Crawford effect explained by perception of backscattered light from the choroid.
To explain the wavelength dependence of the directional sensitivity of human foveal cones (Stiles-Crawford I effect) we extended an existing fundus reflectance model for calculation of the total absorption by visual pigment. We took experimental data from literature for both the psychophysical and the optical Stiles-Crawford effect and optimized parameters to fit the experimental data. The wavelength dependence of the Stiles-Crawford effect could be well described with the geometrical optics model. Essential elements are self-screening and the inclusion of backscattered choroidal light for perception.
Berendschot
T J
TJ
Department of Ophthalmology, University Medical Center Utrecht, The Netherlands. tosb@isi.uu.nl
van de Kraats
J
J
van Norren
D
D
D002829:Choroid / Q000502:physiology*; D005584:Fovea Centralis / Q000502:physiology; D005654:Fundus Oculi; D006801:Humans; D008027:Light; D008954:Models, Biological; D011601:Psychophysics; D011680:Pupil; D017949:Retinal Cone Photoreceptor Cells / Q000502:physiology; D012168:Retinal Pigments / Q000502:physiology; D012542:Scattering, Radiation; D014785:Vision, Ocular / Q000502:physiology*
D012168:Retinal Pigments