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Prolapse, abnormal depression, or falling down of an organ or part; applied especially to drooping of the upper eyelid, from paralysis of the third cranial nerve.



drooping of the upper eyelid. It may be unilateral or bilateral, total or partial, or congenital or acquired. Congenital ptosis is caused by incomplete development or absence of the muscle that lifts the upper lid. The condition is treated by surgery.

Acquired ptosis is generally unilateral; it results from such diseases as neuritis of the oculomotor nerve and encephalitis, which lead to paresis or paralysis of the oculomotor nerve that innervates the muscle lifting the upper lid. The condition is treated by eliminating the underlying disease, by physiotherapy, and occasionally by surgery.

References in periodicals archive ?
The testing involved digital photograph analysis of the participant's ptotic eye under two conditions, specifically with no crutch and when wearing the ptosis crutch.
The volume displacement technique is more suitable for patients with the enlarged, heavy, ptotic breasts, needing correction from cosmetic point of view.
In the upright position, she had very large symmetrical ptotic breasts without visual deformity.
Postpartum, the process of involution starts: the stromal tissue is replaced with fatty tissue and the breast becomes more ptotic.