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To evaluate the quantitative changes in botulinum toxin A (BTA) treatment required over time to achieve relief for 3 to 4 months in patients with essential blepharospasm (EBS) and idiopathic hemifacial spasm (IHFS).Interventional case series.In this retrospective longitudinal study in an institutional ophthalmologic outpatient clinic, data were retrieved from patient files and a comparison between...