Inclusion Criteria:  Patients with an established diagnosis of idiopathic benign essential blepharospasm Must have had prior response to to botulinum toxin (BoNT) reported on last 2 consecutive injection cycles Last injection of BoNT at least 8 weeks prior to Screening assessments Patient is experiencing features of Blepharospasm (BSP) of moderate severity/frequency at study entry.  Exclusion Criteria:  BSP that is known or suspected to be associated with a known cause such as neuroleptic exposure, brain injury or lesion, stroke, Parkinson's disease, or related Parkinsonisms History of surgical intervention (e.g., deep brain stimulation) or orbital myectomy for dystonia Disabling eyelid opening apraxia Other neurological disease (including psychiatric disease and/or cognitive impairment) that, in the opinion of the investigator, would affect the patient's ability to complete study assessments. Other significant medical condition that may affect the safety of the patient or preclude adequate participation in the study.  Other protocol-defined inclusion and exclusion criteria may apply