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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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The ptosis crutch was prototyped using a combination of 3D printing and manual manufacturing.
Figure 6 displays the final ptosis crutch prototype attached to the superior border of the spectacle frame.
The ptosis crutch described by this project provides an important step in offering a standard rather than an ad-hoc solution to elevating the ptotic eyelid of MG patients.
The ptosis crutch was designed following a user-centred design process.
Effectivity was defined as the ability of the ptosis crutch to effectively elevate the upper eyelid to clear the visual axis.
The efficiency of the ptosis crutch describes the device's use of resources.
The initial feedback from the participants indicated that the ptosis crutch improved their vision.
The present study sought to design a low cost, modular and adjustable ptosis crutch for the MG patient population.