Visual Evoked Potential

What does it measure?

pergvep2A visual evoked potential (VEP) measures the time it takes for nerves to respond and the strength of the response when the eyes are stimulated by a flashing light or test pattern. The pattern reversal VEP can be used as an objective measure of visual acuity.

How is it measured?

Electrical responses can be recorded from the primary or secondary visual cortex using conducting gel and electrodes taped to the appropriate areas of the scalp.

Why is it important?

Cortical electrical activity can estimate central processing function. Abnormal response times can be associated with neurological diseases or damaged optic nerves and eyes. Assessment of visual evoked potentials can help to prevent blindness and other forms of vision loss that may occur as a result of optic nerve damage.