Abstract: The present invention relates to a medical system (20) for measuring visual evoked potentials (VEP) of a person, comprising a display (2) for displaying images to be observed by the person with a single eye, and an image generating module (1), the image generating module (1) being configured to cause the display (2) to display a sequence of images comprising a first image and a second image. The medical system (20) further comprises: a plurality of electrodes (3) configured to be attached to the scalp of the person and to detect EEG signals indicative of electrical activity in the brain of the person in response to observing said sequence of images displayed by the display (2), an EEG recording module (4) connected to said plurality of electrodes (3), the EEG recording module (4) being configured to record said EEG signals, and an analyzing module (8), the analyzing module (8) being configured to derive from said EEG signals recorded by the EEG recording module (4) at least one visual evoked potential (VEP).