What is a VEP?

A Visual Evoked Potential (VEP) is a computer averaged brainwave response to a visual stimulus such as a checkerboard pattern on a computer screen. It records the latency of responses down the optic nerve after visual stimulation. The VEP is used as an objective measure of visual function. Patients are assessed when presenting with eye movement disorders, optic nerve dysfunction, cortical blindness and assorted neuro-ophthalmological conditions.

Here is an example of a Visual Evoked Potential.