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).

A rare syndrome characterized by congenital ptosis and posterior fusion of the lumbosacral vertebrae. It has been described in a mother and her two daughters.

A rare, genetic, lens position anomaly disease characterized by bilateral congenital blepharoptosis, ectopia lentis and high grade myopia. Additional reported manifestations include abnormally long eye globes and signs of levator aponeurosis disinsertion. There have been no further descriptions in the literature since 1982.

Hereditary congenital ptosis occurs in 3 main forms: simple; with external ophthalmoplegia; and with blepharophimosis. See PTOS2 (300245) for description of an X-linked form of congenital bilateral isolated ptosis.