Visual function is usually considered to be normal in papilledema. We report previously undescribed abnormalities in the electroretinograms (ERG) and visual evoked potentials (VEP) of two patients with chronic papilledema. The steady-state latencies of the ERG and VEP were calculated using time-difference analysis. The ERG was abnormal under both scotopic (slow) and photopic (fast) flicker cond...

BACKGROUND The CNS manifestations of the antiphospholipid syndrome (APS) can mimic multiple sclerosis both clinically and radiologically. OBJECTIVE To compare evoked potential studies in APS patients and patients with multiple sclerosis with similar neurological disability. METHODS 30 APS patients with CNS manifestations and 33 patients with definite multiple sclerosis and similar neurologi...

The natural visual acuities of 15 adult persons were predicted on the basis of changes in visual evoked potentials (VEP's) to flashed patterns of various sized dots. An objective method was used to quantify the VEP's, based on the minimum-sized stimulus that would elicit a pattern VEP- the VEP pattern threshold. This measure was highly correlated with recognition and resolution measures of perc...

PURPOSE Evoked potentials were recorded in patients with DCD to evaluate the integrity the afferent pathways and to rule out the presence of any neurological lesions. MATERIAL AND METHODS Two boys: 5 and 16 years old with recognized DCD were examined. Battery of tests: short-latency somatosensory evoked potentials (SEP), pattern-reversal visual evoked potentials (VEP), cognitive event-related...

Visually evoked potentials (VEP) were recorded from infants two to six months of age using a checkerboard pattern reversal stimulus. By six months, infants produced the largest amplitude VEP to checks subtending visual angles of 7.5 or 15 minutes of arc, as do adults with 20/20 acuity. This finding indicates that by six months an infant's sensory capacity for a visual acuity of 20/20 is establi...

Swelling of the optic disc may result from inflammation, infiltration, nerve compression or ischaemia, as well increased intracranial pressure. It can be imitated by local structural features leading to pseudopapilloedema. Disease entities swelling take different courses in paediatric population compared adult population. Investigations used confirm diagnosis include optical coherence tomograph...

We made an electroretinographic (ERG) and visual evoked potential (VEP) study of 12 patients with Friedreich's ataxia whose diagnosis was established using the Quebec diagnostic criteria. ERGs and VEPs were elicited to the same stimulating conditions. Flash evoked luminance changes and pattern-specific evoked potentials to check and diamond stimuli were used. Statistical analysis of the data wa...

The last 15 years have seen a rapid expansion in studies on human visual evoked potentials (VEP), both a t the fundamental and at the clinical level. A wide variety of stimulus conditions have been explored,’ new types of mathematical tools have been i n t r o d ~ c e d , ~ . ~ and there has been an increasing appreciation of possible VEP correlates with underlying physiological mechanisms! Var...

background: we compared the wave amplitude of visually evoked potential (vep) between patients with esotropic and anisometropic amblyopic eyes and a normal group. methods: the wave amplitude of vep was documented in 2 groups of persons with amblyopia (15 with esotropia and 28 with anisometropia) and 1 group of individuals with normal visual acuity (n, 15). the amplitude of p100 was recorded mon...

INTRODUCTION T he neurological electrical activity set off by a light stimulus is known as visual evoked potential (VEP) and is obtained by skin electrodes placed over the occipital cortex after repeated retinal stimulation. The VEP reflects the optic pathways functionality from the retina until the occipital visual cortex, and the measurable electric wavelets generated by bright flashing light...