 Computed tomography (CT) or magnetic resonance imaging (MRI) may be ordered to help determine whether there is a lesion or other pathological cause present in the brain or brainstem.Electromyography may be used to aid the diagnosis.Botulinum toxin injected into the pretarsal orbicularis oculi muscle has been shown to be beneficial in some cases associated with orbicularis oculi contraction or blepharospasm.