What is an EEG?
Visual evoked potential (VEP) is a highly-advanced vision test that objectively measures how well your entire vision system is working. The results of this VEP vision test will help your doctor diagnose various vision disorders, and better understand when changes in your visual function occur.
An EEG tracks and records brain wave patterns. Small flat metal discs called electrodes are attached to the scalp with wires. The electrodes analyze the electrical impulses in the brain and send signals to a computer that records the results.
The electrical impulses in an EEG recording look like wavy lines with peaks and valleys. These lines allow doctors to quickly assess whether there are abnormal patterns. Any irregularities may be a sign of seizures or other brain disorders.
An EEG is used to detect problems in the electrical activity of the brain that may be associated with certain brain disorders. The measurements given by an EEG are used to confirm or rule out various conditions, including:
- seizure disorders (such as epilepsy)
- head injury
- encephalitis (inflammation of the brain)
- brain tumor
- encephalopathy (disease that causes brain dysfunction)
- memory problems
- sleep disorders
When someone is in a coma, an EEG may be performed to determine the level of brain activity. The test can also be used to monitor activity during brain surgery.