visual evoked potential
Also written as: VEP — visual evoked potential
Electrical responses recorded from the visual cortex following visual stimulation.
Full Definition
Visual evoked potential (VEP) is an electrophysiological test that measures the electrical activity generated by the visual cortex in response to visual stimuli. The test typically uses pattern-reversal checkerboards or flash stimuli while recording from electrodes placed over the occipital region. VEP testing evaluates the entire visual pathway from the retina through the optic nerves, chiasm, tracts, and visual cortex. The test is particularly useful for detecting optic nerve dysfunction, multiple sclerosis, and other disorders affecting the visual pathway, even when visual symptoms are subtle or absent.
Usage
Usage note: Pattern-reversal VEP is the standard clinical protocol.
In Context
- "The visual evoked potential showed delayed P100 latency in the right eye, suggesting optic nerve demyelination." — Multiple sclerosis workup
- "Pattern VEP testing revealed asymmetric responses consistent with chiasmal compression." — Neuro-ophthalmology report