Visual Evoked Potential

VEP provides information regarding conduction in visual pathway from the retina to brain (occipital cortex).
VEP is recommended for following diseases:

Impairment of vision due to:

  • Multiple Sclerosis.
  • Optic Neuritis.
  • Tumours of the brain (pituitary tumours).
  • Head injuries.
  • Drugs which may cause visual impairment.
  • In children with mental retardation/ delayed development to assess visual status.

Details of Procedure:

  • The test is performed in dark room.
  • Each eye is tested separately.
  • The patient is asked to focus on a point on the monitor, which shows Checkerboard pattern.
  • Small metals plates (electrodes) are applied to the head, which record the Electrical potential.
  • The procedure usually take approximately 30 minutes.


  • Hair should be washed, dried, with no oil, gel, spray etc.
  • If the patient is using spectacles or contact lenses than he/she should wear them at the time of examination.
  • For children who are uncooperative sedation may be required.

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