Visual evoked potential changes following Botox administration in patients with blepharospasm.

Purpose: To examine visual evoked potential (VEP) changes following botulinum toxin type A (BTA) administration in patients with blepharospasm.

Methods: Patients diagnosed with blepharospasm receiving BTA administration were included in the study. Three groups, a control group and two study groups (patients examined 14 days after BTA administration-Study Group 1, and patients examined 28 days after BTA administration-Study Group 2) were evaluated.