One of the major complications of a peripheral facial nerve palsy (PFP) is the occurrence of corneal ulceration due to lagophthalmos—that is, incomplete closure of the affected eyelid. It is widely accepted that lagophthalmos after PFP is directly caused by paresis of the orbicularis oculi muscle (eyelid closure muscle). Yet, some of the signs and symptoms, which may be observed in patients with PFP cannot be explained by paresis …