Results 101 to 110 of about 6,792 (131)

Spatial linearity of the pattern electroretinogram

Journal of the Optical Society of America A, 1991
We modeled the spatial-frequency sensitivity of the human pattern-reversal electroretinogram (PERG) with the linear, two-parameter, spatially bandpass model of Kelly [J. Opt. Soc. Am. A 2, 810 (1985)]. In the model temporal linearity or linearity with luminance is not assumed, but linearity with contrast is assumed.
J, Yang, A, Reeves, M A, Bearse
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Pattern electroretinogram and luminance electroretinogram in Alzheimer’s disease

1991
Visual symptoms are often among the first complaints of patients suffering from Alzheimer's disease and several studies showed a delay in flash visual evoked potentials. Hinton et al. (1986) described optic nerve degenerations in patients with Alzheimer's disease and Sadun published a dropout of retinal ganglion cells that range from 30% to 60%.
K, Strenn, P, Dal-Bianco, H, Weghaupt, G, Koch, C, Vass, I, Gottlob   +5 more
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Update on the Pattern Electroretinogram in Glaucoma

Optometry and Vision Science, 2008
ABSTRACT Purpose. To review the efficacy of the pattern electroretinogram (PERG) in early diagnosis of glaucoma. Methods. Stimulation parameters of check size and temporal frequency are considered. Analyses of various
Bach, Michael, Hoffmann, Michael B.
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Test–retest repeatability of the pattern electroretinogram and flicker electroretinogram

Documenta Ophthalmologica, 2019
To evaluate the repeatability of the steady-state pattern electroretinogram (PERG) and full-field flicker electroretinogram (Flicker ERG) protocols, delivered by the office-based Neuro Optic Vision Assessment (NOVA)™ testing platform, in healthy subjects.Healthy individuals underwent PERG (16° and 24°) and Flicker ERG [fixed luminance (FL) and multi ...
Arthur F, Resende, Carina T, Sanvicente, Hamoon, Eshraghi, Alberto, Garcia, Kassandra, Pickel, Qiang, Zhang, Michael, Waisbourd, L, Jay Katz   +7 more
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Pattern electroretinogram of the blue cones

Graefe's Archive for Clinical and Experimental Ophthalmology, 1989
In man the electroretinogram to pattern reversal stimuli (P-ERG) represents a cone response of the proximal retina, dominated by the cone mechanisms sensitive to red (R) and green (G). Additionally there is a cone mechanism sensitive to blue (B) which can be studied with and without steady exposure to yellow light.
G, Niepel, E, Dodt
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The Pattern Electroretinogram

Journal of Clinical Neurophysiology, 1989
The pattern electroretinogram (PERG), thought to be generated in retinal ganglion cells, is a recent addition to the neurophysiologic assessment of retinal function. Factors that affect the PERG include type of pattern-reversal stimulus, spatial frequency of the pattern, luminance and contrast of the pattern, method of waveform processing, type of ...
S, Rimmer, B, Katz
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The (??) Reference in Pattern Electroretinogram Recording

Optometry and Vision Science, 1989
ABSTRACT In this communication, the value of using a simultaneously acquired estimate of background noise, the (±) reference, is demonstrated in pattern electroretinogram (PERG) recording. During the signal averaging process, the (±) reference inverts the polarity of every other sweep; cycle‐locked (stimulus‐related) activity thus ...
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The Pattern-Elicited Electroretinogram

Ophthalmologica, 2010
The pattern-elicited electroretinogram (PERG) was recorded in 75 patients known with glaucoma, each one of them having a normal visual acuity, and compared with the results in normal test subjects. Although there is a great overlap between normal and glaucomatous eyes, a lower average amplitude and a delay in latency is recorded in the case of glaucoma.
P.J. Ringens, G.H.M. van Lith, H.v.d. Poel   +2 more
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Normal strobe electroretinograms without pattern electroretinograms in albino rats

Documenta Ophthalmologica, 1987
Electroretinograms (ERGs) were obtained from pigmented and albino rats to step luminance changes of an unpatterned TV screen. Surround luminance was increased until the ERG became small and focal. In pigmented rats the ERG at on was positive, earlier, and about twice the amplitude of the negative ERG at off.
, Vaegan, J A, Burne
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Pattern Electroretinograms in Preperimetric and Perimetric Glaucoma

American Journal of Ophthalmology, 2020
To investigate whether visual function can be graded in detail using pattern electroretinogram (PERG) in preperimetric to perimetric glaucoma.Cross-sectional observational study.Twenty-six normal subjects, 113 preperimetric glaucoma patients (which included glaucoma suspect patients), and 52 early perimetric glaucoma patients with a mean deviation (MD)
Kyoung In Jung, Sooji Jeon, Da Young Shin, Jiyun Lee, Chan Kee Park   +4 more
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