Photoreceptor directional sensitivity in normals, dichromats and S-cone monochromats
| Autor: | Claudia Schulze-Döbold, Lindsay T. Sharpe, Herbert Jägle |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Retina
Measurement method medicine.medical_specialty genetic structures business.industry Stiles–Crawford effect Trichromacy Receptor type Biology Colour blind Atomic and Molecular Physics and Optics Retinal eccentricity medicine.anatomical_structure Optics Foveal Ophthalmology medicine sense organs business |
| Zdroj: | Journal of Modern Optics. 56:2189-2202 |
| ISSN: | 1362-3044 0950-0340 |
| Popis: | The Stiles–Crawford function (SCF) of foveal and 10° peripheral photoreceptors was examined in five normal trichromats, three protanopes, two deuteranopes and two S-cone monochromats on a three-channel Maxwellian-view system. The isolating conditions for L-, M- and S-cones were confirmed by heterochromatic flicker photometry. The magnitude of the SCF was found to be concordant with the anatomical variations of the photoreceptors due to receptor type and retinal eccentricity. At the different locations, the SCF was similar in trichromats, dichromats and S-cone monochromats, but varied considerably between observers, regardless of phenotype. Large differences in the number and/or type of functioning cones–as found in normal and colour blind observers–do not seem to influence cone directional properties and as a consequence cone morphology–the SCF being mainly influenced by anatomical changes. |
| Databáze: | OpenAIRE |
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