Unusual topographic specializations of retinal ganglion cell density and spatial resolution in a cliff‐dwelling artiodactyl, the Nubian ibex ( Capra nubiana )

2019 ◽  
Vol 527 (17) ◽  
pp. 2813-2825
Author(s):  
João Paulo Coimbra ◽  
Abdulaziz N. Alagaili ◽  
Nigel C. Bennett ◽  
Osama B. Mohammed ◽  
Paul R. Manger
Keyword(s):  
Ganglion Cell ◽  
Cell Density ◽  
Retinal Ganglion Cell ◽  
Spatial Resolution ◽  
Retinal Ganglion

scholarly journals Nerve Fiber Layer Thinning Lags Retinal Ganglion Cell Density Following Crush Axonopathy

2014 ◽  
Vol 55 (10) ◽  
pp. 6505 ◽  
Author(s):  
Gustavo C. Munguba ◽  
Sanja Galeb ◽  
Yuan Liu ◽  
David C. Landy ◽  
Daisy Lam ◽  
...  
Keyword(s):  
Ganglion Cell ◽  
Nerve Fiber ◽  
Cell Density ◽  
Retinal Ganglion Cell ◽  
Retinal Ganglion ◽  
Fiber Layer ◽  
Nerve Fiber Layer

scholarly journals The Relationship Between Macula Retinal Ganglion Cell Density and Visual Function in the Nonhuman Primate

2021 ◽  
Vol 62 (1) ◽  
pp. 5
Author(s):  
Kwame Antwi-Boasiako ◽  
Louvenia Carter-Dawson ◽  
Ronald Harwerth ◽  
Margaret Gondo ◽  
Nimesh Patel
Keyword(s):  
Ganglion Cell ◽  
Cell Density ◽  
Retinal Ganglion Cell ◽  
Nonhuman Primate ◽  
Visual Function ◽  
Retinal Ganglion ◽  
The Relationship

The Topographic Organization of Retinal Ganglion Cell Density and Spatial Resolving Power in an Unusual Arboreal and Slow-Moving Strepsirhine Primate, the Potto (Perodicticus potto)

2016 ◽  
Vol 87 (1) ◽  
pp. 4-18 ◽  
Author(s):  
João Paulo Coimbra ◽  
Consolate Kaswera-Kyamakya ◽  
Emmanuel Gilissen ◽  
Paul R. Manger ◽  
Shaun P. Collin
Keyword(s):  
Ganglion Cell ◽  
Cell Density ◽  
Retinal Ganglion Cells ◽  
Spatial Resolution ◽  
Ganglion Cells ◽  
Resolving Power ◽  
Retinal Ganglion ◽  
Upper Limits ◽  
Slow Moving ◽  
Topographic Distribution

The potto (Perodicticus potto) is an arboreal strepsirhine found in the rainforests of central Africa. In contrast to most primates, the potto shows slow-moving locomotion over the upper surface of branches, where it forages for exudates and crawling invertebrates with its head held very close to the substrate. Here, we asked whether the retina of the potto displays topographic specializations in neuronal density that correlate with its unusual lifestyle. Using stereology and retinal wholemounts, we measured the total number and topographic distribution of retinal ganglion cells (total and presumed parasol), as well as estimating the upper limits of the spatial resolution of the potto eye. We estimated ∼210,000 retinal ganglion cells, of which ∼7% (∼14,000) comprise presumed parasol ganglion cells. The topographic distribution of both total and parasol ganglion cells reveals a concentric centroperipheral organization with a nasoventral asymmetry. Combined with the upwardly shifted orbits of the potto, this nasoventral increase in parasol ganglion cell density enhances contrast sensitivity and motion detection skywards, which potentially assists with the detection of predators in the high canopy. The central area of the potto occurs ∼2.5 mm temporal to the optic disc and contains a maximum ganglion cell density of ∼4,300 cells/mm2. We found no anatomical evidence of a fovea within this region. Using maximum ganglion cell density and eye size (∼14 mm), we estimated upper limits of spatial resolving power between 4.1 and 4.4 cycles/degree. Despite their reported reliance on olfaction to detect exudates, this level of spatial resolution potentially assists pottos with foraging for small invertebrates and in the detection of predators.

scholarly journals Relationship between Psychophysical Measures of Retinal Ganglion Cell Density and In Vivo Measures of Cone Density in Glaucoma

Ophthalmology ◽  
2017 ◽  
Vol 124 (3) ◽  
pp. 310-319 ◽  
Author(s):  
Juliane Matlach ◽  
Pádraig J. Mulholland ◽  
Marketa Cilkova ◽  
Reena Chopra ◽  
Nilpa Shah ◽  
...  
Keyword(s):  
Ganglion Cell ◽  
Cell Density ◽  
Retinal Ganglion Cell ◽  
Retinal Ganglion ◽  
Cone Density
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