Ptosis (eyelid)

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Ptosis of the eyelids
Ptosis of the left eyelid (unilateral ptosis). A headshot daguerreotype of an unidentified male, by William Bell in 1852.
Pronunciation	/ˈtoʊsɪs/
Specialty	Ophthalmology, optometry, neurology

Ptosis, also known as blepharoptosis,^[1] is a drooping or falling of the upper eyelid. This condition is sometimes called "lazy eye", but that term normally refers to the condition amblyopia. If severe enough and left untreated, the drooping eyelid can cause other conditions, such as amblyopia or astigmatism, so it is especially important to treat the disorder in children before it can interfere with vision development.

The term is from Greek πτῶσις 'fall, falling'.