Congenital causes, oculomotor nerve palsy, myasthenia gravis, post-traumatic causes, and more rarely, Marcus- Gunn jaw-winking
(MGJWS) syndrome and aponeurotic ptosis are considered among the causes.
Along with this, margin reflex distance 1 and 2, yawn for Marcus Gunn jaw-winking phenomenon were examined.
Levator disinsertion with frontalis sling surgery were done in 13 patients with Marcus Gunn jaw-winking phenomenon (8.9%).
 Ptosis may be congenital wherein the levator muscle is dystrophic, or it may be associated with Marcus Gunn jaw-winking and neurogenic or myogenic causes such as third nerve palsy, blepharophimosis syndrome, myasthenia gravis, and so on.
Ptosis evaluation included palpebral fissure height, median reflex distance (MRD), levator function, jaw-winking phenomenon, Bell's phenomenon, and corneal sensations.
Frontalis suspension with the transposed levator palpebrae superioris has been done in severe jaw-winking with fair results16.
Results of levator excision followed by fascia lata brow suspension in patients with congenital and jaw-winking ptosis.
Kayleigh was born with a rare congenital condition called Marcus Gunn Jaw-Winking
Syndrome, which means one of her eyelids drops when she chews or sucks.
It may be associated with third nerve misdirection, Marcus-Gunn jaw-winking
phenomenon or blepharophimosis syndrome.