Which physical findings are characteristic of benign essential blepharospasm (BEB)?

Updated: May 20, 2019
  • Author: Robert H Graham, MD; Chief Editor: Edsel Ing, MD, MPH, FRCSC  more...
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Answer

In normal blinking, eyelid closure is the result of activity and co-inhibition of 2 groups of muscles, the protractors of the eyelids (ie, orbicularis oculi, corrugator superciliaris, procerus muscles) and the voluntary retractors of the eyelids (ie, levator palpebrae superioris, frontalis muscles). During the normal blink, the protractors and retractors have co-inhibition and function only at separate times. In patients with blepharospasm, this inhibition between the protractors and retractors is lost.


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