Results 121 to 130 of about 3,923 (179)

Characterization of the Most Resistant and Vulnerable Retinal Ganglion Cell Subtypes in a Chronic Model of Glaucoma in Rat. [PDF]

Invest Ophthalmol Vis Sci
Ruzafa N, Pereiro X, Prieto-López L, Urcola A, Acera A, Vecino E.   +5 more
europepmc   +1 more source

Melanopsin: an exciting photopigment

Trends in Neurosciences, 2008
The discovery that mice lacking rods and cones are capable of regulating their circadian rhythms by light provided the conceptual framework for the discovery of an entirely new photoreceptor system within the mammalian eye. We now know that a small subset of retinal ganglion cells are directly photosensitive and utilize an opsin/vitamin A-based ...
Mark W Hankins, Stuart N Peirson, Russell G Foster   +2 more
exaly   +3 more sources

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A unifying presentation of photopigment spectra

Vision Research, 1986
E F Macnichol
exaly   +3 more sources

Photopigments and pseudo-pigments

Vision Research, 1977
Abstract The spectral properties of photopigments are often inferred from physiological measures of spectral sensitivity. From these measures pigments have recently been inferred with properties not corresponding to those of any pigment measured by spectrophotometry.
L, Sirovich, I, Abramov
openaire   +2 more sources

Vitamin A deprivation and Drosophila photopigments

Nature, 1977
VITAMIN A deprivation causes a profound reduction in visual sensitivity and photopigment concentration in the eyes of both vertebrates and invertebrates1,2. In vertebrates vitamin A deprivation results in degeneration of photoreceptor cells3 and decreases the number of intramembrane particles visualised in the disks of rod outer segments by freeze ...
W A, Harris, D F, Ready, E D, Lipson, A J, Hudspeth, W S, Stark   +4 more
openaire   +2 more sources

Photopigments in Central Serous Chorioretinopathy

American Journal of Ophthalmology, 2011
To investigate functional abnormalities in eyes with central serous chorioretinopathy (CSC).Observational case series.Sixteen eyes with CSC were enrolled. Autofluorescence densitometry was performed to measure the optical density of the photopigments. Serial fundus autofluorescence (FAF) images were obtained by Heidelberg Retina Angiogram 2.
Akira, Ojima, Tomohiro, Iida, Tetsuju, Sekiryu, Ichiro, Maruko, Yukinori, Sugano   +4 more
openaire   +2 more sources

Studies on the photopigment system in Phycomyces

Biochemical and Biophysical Research Communications, 1970
Abstract Light-induced changes in optical density in the region of the action spectra of Phycomyces have been found in vivo and in vitro . The optical density changes are reversed after incubation in the dark for 5 to 12 min. Fluorescence excitation peaks at 345 and 460 nm are demonstrated to reflect the optical density changes ...
D S, Berns, J R, Vaughn
openaire   +2 more sources

Photopigments and circadian systems of vertebrates

Biophysical Chemistry, 1995
In the retinal degeneration (rd) mouse the absence of rod cells and the progressive loss of cones does not result in a decrease in circadian phase shifting responses to light. By contrast, rd/rd mice are unable to perform simple visual tasks. In addition, rodless transgenic mice, and mice homozygous for the retinal degeneration slow (rds) mutation ...
S M, Argamaso, A C, Froehlich, M A, McCall, E, Nevo, I, Provencio, R G, Foster   +5 more
openaire   +2 more sources

Aging and human cone photopigments

Annual Meeting Optical Society of America, 1986
Previous studies1,2 have disagreed about the effects of aging on human cone optical densities. We have examined the question of whether there are age-related changes in the density and half-bleach illuminance of normal observers. We used a color-matching method to measure the optical density of the photopigments within cones.
A E, Elsner, L, Berk, S A, Burns, P R, Rosenberg   +3 more
openaire   +2 more sources

Foveal Photopigments

Optometry and Vision Science, 1992
ABSTRACT The relative rates of absorption of quanta per unit of energy for the various wavelengths can be assessed for the human red, green, and blue photoreceptors by assuming that the responses generated by a photoreceptor are proportional to the rate of absorption of quanta.
openaire   +2 more sources