𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Fluctuations of visual evoked potential amplitudes and of contrast sensitivity in Uhthoff's symptom

✍ Scribed by H. Wildberger; H. Hofmann; J. Siegfried

Publisher
Springer-Verlag
Year
1987
Tongue
English
Weight
420 KB
Volume
65
Category
Article
ISSN
0012-4486

No coin nor oath required. For personal study only.

✦ Synopsis

Visual evoked potentials (VEPs) to pattern reversal and psychophysical contrast sensitivity (CS) were tested in five patients with UhtholTs symptom before and after exercise. Four of the cases were related to a demyelinating disease and one patient had a severe brain injury. UhtholTs symptom occurred also in neuropathies without previous clinical neuritis and in eyes with normal latency time of the VEPs. A depression of CS was observed by all five patients after exercise; a transient "overshoot" of CS following the depression was present in three of the patients. VEP amplitudes were reduced by exerefse in three cases. Responses by stimulation with small checks were more affected. Paradoxical increased VEP amplitudes after exercise in the presence of a loss of psychophysical CS were found in one case.

πŸ“œ SIMILAR VOLUMES

Contrast sensitivity and pattern visual
Contrast sensitivity and pattern visual evoked potential in patients with glaucoma
✍ Haruki Abe; Shigeru Hasegawa; Kazuo Iwata πŸ“‚ Article πŸ“… 1987 πŸ› Springer-Verlag 🌐 English βš– 342 KB

Contrast sensitivity and pattern visual evoked potential (VEP) were measured in cases of ocular hypertension and primary open-angle glaucoma at various stages. The visual field of each eye was examined quantitatively and the retinal nerve fiber layer and optic disc were precisely assessed with magni

Objective measurement of contrast sensit
Objective measurement of contrast sensitivity using the steady-state visual evoked potential
✍ Shuai Chen; Lezheng Wu; Dezheng Wu πŸ“‚ Article πŸ“… 1990 πŸ› Springer-Verlag 🌐 English βš– 387 KB

Contrast sensitivity functions (CSFs) were determined electrophysiologically with the steady-state visual evoked potential (VEP). Psychophysical CSFs obtained by the method of increasing contrasts were also measured concurrently with the VEP trials. The VEP contrast thresholds were obtained using a

Comparison of preoperative 10-Hz visual
Comparison of preoperative 10-Hz visual evoked potentials to contrast sensitivity and visual acuity after cataract extraction
✍ Sheri A. Cavender; Robert R. Hobson; Gung-Mei Chao; George W. Weinstein; J. Vern πŸ“‚ Article πŸ“… 1992 πŸ› Springer-Verlag 🌐 English βš– 415 KB

Cataract patients whose surgical outcomes were in question were referred for testing by visual evoked potentials, elicited through closed eyelids by a luminance stimulus (flash) that appeared 10 times per second. Visual evoked potentials were rated as normal (predicted acuity of 20/50 or better) or

The effect of spatial frequency and cont
The effect of spatial frequency and contrast on the latency in the visual evoked potential
✍ Peter Jakobsson; BjΓΆrn Johansson πŸ“‚ Article πŸ“… 1992 πŸ› Springer-Verlag 🌐 English βš– 424 KB

The latency in the visual evoked potential was measured at spatial frequencies of 2-12 c/deg in 10 subjects. The contrast levels of the sinuosoidal grating patterns were set at 1.5, 1.75, 2.0, 2.25, 2.5, 2.75 and 3.0 log units above each subject's contrast sensitivity threshold. Two factors were sho

Contrast sensitivity differences between
Contrast sensitivity differences between strabismic and anisometropic amblyopia: objective correlate by means of visual evoked responses
✍ Emilio C. Campos; Maria Luisa Prampolini; Rozanna Gulli πŸ“‚ Article πŸ“… 1984 πŸ› Springer-Verlag 🌐 English βš– 230 KB

The visual evoked response transfer function of amblyopic subjects was studied. Strabismic amblyopes showed abnormalities only in the high spatial frequency range. Anisometropic amblyopes on the contrary, showed an abnormal function both in the low and high spatial frequency range. This is an object