visual evoked potential (VEP)

A visual evoked potential (VEP) is a test that measures how the brain responds to visual stimuli. During the test, small electrodes are placed on the scalp over the back of the head, and the patient looks at a pattern, such as a checkerboard that flickers or alternates. The electrodes detect the electrical signals generated in the visual pathways from the eyes to the brain. By analyzing these signals, doctors can assess the health and function of the visual system, helping to diagnose conditions like optic nerve problems, multiple sclerosis, or other neurological issues affecting vision.