Visually evoked potentials and electroretinography in neurologic evaluation.

摘要: Electrophysiologic testing of the visual system requires primarily ERG and VEP. The flash electroretinogram provides information about outer retina only. pattern is derived from both innermost retinal layers including ganglion cell layer. VEP based on electrical recorded cortex in response to stimulation retina. Thus, integrity entire pathway can be tested. Localizing ability limited. Since heavily weighted by representation central retina, peripheral lesions, those producing field abnormalities that do not impinge upon fixation, may produce relatively little disturbance As with most tests, electrophysiologic studies must placed context examination, patient's history neurologic especially neuro-ophthalmologic evaluation. has three main uses neurology. Pattern-reversal VEPs useful detecting hidden loss multiple sclerosis; ERGs distinguish function organic loss; diagnosis nonverbal patients, children.