Results 261 to 270 of about 108,777 (309)
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Visual Neuroscience, 2007
With age many retinal neurons are lost. In humans the rod photoreceptor population in the perimacular region is subject to approximately 30% loss over life. Those that remain have been reported to suffer from extensive convolutions and localized swellings of their outer segments abnormally increasing their disc content and outer segment length ...
Alexander, Cunea, Glen, Jeffery
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With age many retinal neurons are lost. In humans the rod photoreceptor population in the perimacular region is subject to approximately 30% loss over life. Those that remain have been reported to suffer from extensive convolutions and localized swellings of their outer segments abnormally increasing their disc content and outer segment length ...
Alexander, Cunea, Glen, Jeffery
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Human photoreceptor topography
Journal of Comparative Neurology, 1990AbstractWe have measured the spatial density of cones and rods in eight wholemounted human retinas, obtained from seven individuals between 27 and 44 years of age, and constructed maps of photoreceptor density and between‐individual variability. The average human retina contains 4.6 million cones (4.08–5.29 million).
C A, Curcio +3 more
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Comparative nematode photoreceptors
Comparative Biochemistry and Physiology Part A: Physiology, 1975Abstract 1. 1. The fine structure and spectral absorption of the pigmented photoreceptors of the marine nematodes, Araeolaimus elegans, Chromadorina sp. and Enoplus communis have been examined. The absorption characteristics and fine structure of the “chromatrope” of Mermis nigrescens are reported. 2. 2. E.
N A, Croll, A A, Evans, J M, Smith
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Archives of Ophthalmology, 1983
A 61-year-old woman with progressive blindness, initially responsive to steroid therapy, was found to have an undifferentiated neoplasm in the cervix uteri. Visual fields demonstrated ring scotomas and the electroretinographic pattern eventually became flat. The interval from onset of visual symptoms to blindness was 19 months.
J L, Keltner, A M, Roth, R S, Chang
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A 61-year-old woman with progressive blindness, initially responsive to steroid therapy, was found to have an undifferentiated neoplasm in the cervix uteri. Visual fields demonstrated ring scotomas and the electroretinographic pattern eventually became flat. The interval from onset of visual symptoms to blindness was 19 months.
J L, Keltner, A M, Roth, R S, Chang
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2015
Retina is a neurosensory tissue lining the back of the eye and is responsible for light detection and relaying the signal to the visual cortex in the brain. Mammalian retina consists of six major types of neurons (including photoreceptors; rods and cones) and one type of glial cells arranged in distinct layers. Photoreceptors are the most abundant cell
Linjing, Li +3 more
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Retina is a neurosensory tissue lining the back of the eye and is responsible for light detection and relaying the signal to the visual cortex in the brain. Mammalian retina consists of six major types of neurons (including photoreceptors; rods and cones) and one type of glial cells arranged in distinct layers. Photoreceptors are the most abundant cell
Linjing, Li +3 more
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Photoreceptor Degeneration: Molecular Mechanisms of Photoreceptor Degeneration
2014Rod and cone photoreceptors initiate the visual process by capturing photons and transducing the information into chemical and electrical signals. These functionally specialized neurons have high metabolic activity and oxygen consumption, making them vulnerable to genetic insults and changes in microenvironment.
Jerome E. Roger, Anand Swaroop
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1961
Publisher Summary Photoreceptors are structures containing photosensitive pigments (chlorophyll and retinene) that upon light absorption initiate phototropisms, photosynthesis, and vision. The photoreceptors in plant cells are the chloroplast for photosynthesis; in animal cells they are the retinal rods and cones for vision.
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Publisher Summary Photoreceptors are structures containing photosensitive pigments (chlorophyll and retinene) that upon light absorption initiate phototropisms, photosynthesis, and vision. The photoreceptors in plant cells are the chloroplast for photosynthesis; in animal cells they are the retinal rods and cones for vision.
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