VEP measures a patient's eye-brain feedback time. When the eyes are subjected to visual stimulations, the optic nerve at the back of examination passes on the message to the visual cortex to process that details in the brain. This happens at a very rapid speed, almost instantaneously. It is so fast, that we at http://www.quiklinks.com/article.php?id=47416, feel as though there is no hold-up-- we see something immediately.
 

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