Type : Other, mainly phenotypes with suspected mendelian basis;
Alternative titles and symbols : Maxillopalpebral synkinesis; JAW-WINKING;
Description : The Marcus Gunn phenomenon consists of unilateral congenital ptosis and rapid exaggerated
elevation of the ptotic lid on moving of the lower jaw. Although it usually persists
into adult life, the phenomenon is seen in its most marked forms in infancy when the
rapid spasmodic movements of the lid are apparent during sucking and thus are noted
soon after birth (Doco-Fenzy et al., 2006).;