This rare congenital conditions consists of elevation of a ptotic eyelid when the ipsilateral pterygoid muscle is stimulated - as in chewing, sucking, or opening the mouth. Amblyopia, and strabismus are common
Acquired cases occur after damage to the oculomotor nerve with subsequent innervation of levator palpebrae superioris by a branch of the trigeminal nerve.
Surgical correction may be necessary.
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