Foveal vision
Foveal vision
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中心凹视力
DOI:
10.1016/j.cub.2021.03.097
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发表时间:
2021
期刊:
影响因子:
9.2
通讯作者:
Harmening WM
中科院分区:
文献类型:
--
作者:
Tuten WS;Harmening WM
How is the fovea specialized for spatial vision? In humans, three anatomical characteristics distinguish the fovea from the rest of the retina, all of which reflect optimizations for high-acuity daytime vision. First, cone photoreceptors are distributed to sample space finely, with packing densities peaking around 15,000 cells/deg2. Second, rod photoreceptors, highly sensitive cells that function under low light conditions, are absent from the central most fovea. And third, inner retinal structures—bipolar and retinal ganglion cells, and retinal blood vessels—are displaced centrifugally from the foveal center, resulting in the fovea’s hallmark dimpled profile (Figure 1).Leveraging this unique morphology for high-acuity vision requires that the spatial information encoded by the densely packed foveal cone mosaic is preserved in ascending neural pathways. In primates, midget retinal ganglion cells are presumed to mediate spatial vision in the fovea because they receive excitatory input from just one foveal cone via one midget bipolar cell. The lack of crosstalk in this ‘private-line’circuit ensures that spatial information is not lost in the signal transmitted to the brain. Psychophysical experiments in which optical aberrations—another factor that can limit resolution—are corrected with adaptive optics show that foveal visual acuity is ultimately limited by photoreceptor spacing, reaching values of 20/10 or better—twice as good as the clinical benchmark of 20/20. These results suggest individual foveal cone signals remain segregated up to the locus of perception.
影响因子:
1.8
作者:
Ratnam K;Domdei N;Harmening WM;Roorda A
通讯作者:
Roorda A
影响因子:
1
作者:
N. Victory;Y. Segovia;M. García
通讯作者:
M. García
DOI:
10.1073/pnas.1922294117
发表时间:
2020-06-16
影响因子:
11.1
作者:
Cohen, Michael A.;Botch, Thomas L.;Robertson, Caroline E.
通讯作者:
Robertson, Caroline E.