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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 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.
For the purpose of the current study, it was important to communicate to the participants that the ptosis crutch was not intended to restore the functionality of the muscles involved in eyelid elevation, but rather to act as an aid to manually elevate the eyelid in order to improve their visual function.
The initial feedback from the participants indicated that the ptosis crutch improved their vision.