Directional light-capture efficiency of the foveal and parafoveal photoreceptors at different luminance levels: an experimental and analytical study.
| Autor: | Martins AC; Advanced Optical Imaging Group, School of Physics, University College Dublin, Dublin 4, Ireland., Vohnsen B; Advanced Optical Imaging Group, School of Physics, University College Dublin, Dublin 4, Ireland. |
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| Jazyk: | angličtina |
| Zdroj: | Biomedical optics express [Biomed Opt Express] 2019 Jul 02; Vol. 10 (8), pp. 3760-3772. Date of Electronic Publication: 2019 Jul 02 (Print Publication: 2019). |
| DOI: | 10.1364/BOE.10.003760 |
| Abstrakt: | A gradual drop in visibility with obliquely incident light on retinal photoreceptors is namely described by the Stiles-Crawford effect of the first kind and characterized by a directionality parameter. Using a digital micromirror device in a uniaxial flicker system, here we report on variations of this effect with luminance levels, wavelengths within the visible and near-infrared spectrum and retinal regions ranging from the fovea to 7.5° parafoveal. Results show a consistent directionality in mesopic and photopic conditions. Higher directionality is measured for longer wavelengths, and a decrease with retinal eccentricity is observed. Results are discussed in relation to an absorption model for the visual pigments taking the outer-segment packing and thickness of the neural retina into account. Good correspondence is found without enforcing photoreceptor waveguiding. Competing Interests: The authors declare that there are no conflicts of interest related to this article. |
| Databáze: | MEDLINE |
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