Definition of Ptosis of the eyelids, congenital

Ptosis of the eyelids, congenital: Drooping of the upper eyelids at birth. The lids may droop only slightly, or they may cover the pupils and restrict or even block vision. Moderate or severe ptosis calls for treatment to permit normal vision development. If congenital ptosis of the eyelids is not corrected, amblyopia (lazy eye) may develop, which can lead to permanently poor vision.