VEPs are the electrical response of the brain to a visual stimulus. To
measure the response, three electrodes are placed on the scalp held
on by a soft cream.
Typically VEPs are recorded to a flashing strobe light, reversing and
appearance black and white checkerboards.
The pattern VEP is dominated by activity from the central 5 degrees,
predominantly lower field. This macula predominance means that
pattern VEPs in children can be used as an index of macula pathway
Monocular stimulation with a trans-occipital array of electrodes, and
where possible half field stimulation, can discriminate optic nerve,
chiasmal and hemisphere anomalies.