Effects of the periocular botulinum toxin on the ocular surface and anterior chamber: a prospective study in patients with hemifacial spasm and blepharospasm.

Purpose: To analyze using Pentacam, the corneal and anterior chamber changes following periocular botulinum toxin injection in patients with facial dystonia.

Methods: Prospective study that included patients with facial dystonia that were going to receive a periocular botulinum toxin injection for the first time or six months or more after the previous injection. A Pentacam examination was carried out in all patients before and 4 weeks after the injection.