Journal ArticleDOI
Photoreceptor diameter and spacing for highest resolving power
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TLDR
The maximum center-to-center angular spacing delta phi of photoreceptors tolerated for reconstructing the highest spatial frequency passed by a diffraction-limited pupil of diameter D is delta phI - lambda/D square root 3 when the photoreCEPTors are packed in a hexagonal array, where lambda is the wavelength in vacuum.Abstract:
The maximum center-to-center angular spacing Δϕ of photoreceptors tolerated for reconstructing the highest spatial frequency passed by a diffraction-limited pupil of diameter D is Δϕ = λ/D √3 when the photoreceptors are packed in a hexagonal array, where λ is the wavelength in vacuum. This spacing gives the maximum signal-to-photon noise ratio when the inner segments touch. The mean luminance required for an eye to achieve its highest resolving power is independent of eye size, provided the retina is designed to sample the highest spatial frequency passed by the diffraction-limited optics.read more
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Journal ArticleDOI
Human photoreceptor topography
TL;DR: The total number of foveal cones is similar for eyes with widely varying peak cone density, consistent with the idea that the variability reflects differences in the lateral migration of photoreceptors during development.
Book ChapterDOI
The Topography of Vision in Mammals of Contrasting Life Style: Comparative Optics and Retinal Organisation
Journal Article
Aging of the human photoreceptor mosaic: evidence for selective vulnerability of rods in central retina.
TL;DR: The stability of both rod coverage and rhodopsin content despite decreasing cell number suggests plasticity of the adult rod system and that age-related declines in scotopic sensitivity may be due to postreceptoral factors.
Journal ArticleDOI
Amplification and kinetics of the activation steps in phototransduction
Edward N. Pugh,Trevor D. Lamb +1 more
TL;DR: The investigation of amplification in the activation steps of vertebrate phototransduction shows that kcat/Km probably exceeds 10(7) M-1 s-1 (and is likely to be higher) in both amphibian and mammalian rods, and two different analyses based upon photocurrents were developed which provide lower bounds for kcat /Km in vivo.
Journal ArticleDOI
The ganglion cell and cone distributions in the monkey's retina: Implications for central magnification factors
V H Perry,Alan Cowey +1 more
TL;DR: The distribution of cones and ganglion cells was determined in whole-mounted monkey retinae, revealing that the relative representation of the fovea increases substantially in both thalamus and cortex.
References
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