Results 91 to 100 of about 6,792 (131)
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Variability of the pattern electroretinogram
Documenta Ophthalmologica, 1988Conflicting results have been obtained concerning the parametric properties of the pattern electroretinogram. These discrepancies may be due to the large amount of variability inherent in recording amplitudes. We have found the variability within a single stimulus condition to be so large (ranging from 30% to 67% of the mean value) that it could mask ...
Karen Holopigian, William Seiple
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The influence of early diabetes on the pattern electroretinogram
Documenta Ophthalmologica, 1989Pattern electroretinogram response and contrast sensitivity were evaluated in two groups of diabetic patients by means of psychophysical and electrophysiological methods. The first group consisted of subjects suffering from diabetic retinopathy in various stages of evolution; the second was composed of diabetic patients with no fundus alterations and ...
A Sôdi
exaly +3 more sources
The origins of luminance and pattern responses of the pattern electroretinogram
International Journal of Psychophysiology, 1994A luminance response is spatially insensitive and dependent upon temporal contrast. The contribution of luminance to the pattern onset electroretinogram (PERG) can be estimated from the temporal contrast of a pattern's illuminance profile on the retina.
Dorothy A Thompson, N Drasdo
exaly +3 more sources
Pattern electroretinogram in glaucoma and ocular hypertension
Documenta Ophthalmologica, 1989We recorded the pattern electroretinogram (PERG) to small (0.8 degree) and very large (15 degrees) check sizes in normal subjects, in patients with early-stage glaucoma, and in patients with ocular hypertension. In glaucoma, the PERG amplitude was reduced.
Michael Bach, Bach M
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The Pattern Electroretinogram in Diabetes
American Journal of Ophthalmology, 1990In 27 normal subjects and 64 insulin-dependent diabetic patients, we evaluated the pattern electroretinogram, which may reflect the neural activity of the spatially sensitive retinal ganglion cells. The amplitude of the pattern electroretinogram was reduced in diabetic patients who had no observable retinal changes.
T C, Prager +4 more
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Steady-state electroretinograms and pattern electroretinograms in pigs
Graefe's Archive for Clinical and Experimental Ophthalmology, 2001Electroretinograms (ERG) or pattern-electroretinograms (PERG) could be valuable for the quantification of potential damage to the pig retina by experimental erbium:YAG laser treatment. We therefore performed a normative study of ERGs and PERGs in pigs.We recorded ERGs and PERGs under general anaesthesia in two experiments.
Janknecht, Peter +4 more
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Pattern electroretinograms in ocular hypertension
Documenta Ophthalmologica, 1988The authors recorded pattern electroretinograms at different spatial frequencies in 16 patients affected with ocular hypertension. In 12 of these subjects the electroretinograms dropped in amplitude around 2 cycles/degree. The authors attributed this finding to ocular hypertension, hypothesizing ischemic damage at the head of the optic nerve with ...
AMBROSIO, GENNARO +4 more
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Human pattern-evoked electroretinogram
Journal of Neurophysiology, 1984We have recorded electroretinographic (ERG) responses to grating patterns whose spatial, temporal, and contrast parameters were varied. The resultant evoked potential is dependent on spatial frequency and it exhibits a spatial band-pass characteristic. The peak frequency is dependent on retinal eccentricity.
R F, Hess, C L, Baker
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