Marcus Gunn Syndrome

Marcus Gunn syndrome is a congenital condition where a drooping eyelid briefly opens wider and appears to wink when the jaw is moved. (A congenital condition means a baby is born with it.)
== Rarity ==
Marcus Gunn phenomenon is a rare genetic disorder present at birth. It affects males and females in equal numbers. Approximately 300 cases have been reported in the medical literature.
Category:Rare
Category:Genetics
Category:Eyes
Category:Syndromes