blepharosphincterectomy

bleph·a·ro·sphinc·ter·ec·to·my (blef″ə-ro-sfingk″tər-ekґtə-me) [blepharo- + sphincter + ectomy] excision of some of the fibers of the orbicularis muscle, together with overlying skin, to relieve pressure of the eyelid on the cornea in blepharospasm.