Entropion is the rolling inward of the lid margin towards the eye.

The most common cause of entropion is a part of the aging process, particularly the tissues supporting the lower eyelid.
Scars within surface of the eyelid resulting from inflammation, chronic infections, or trauma may lead to entropion as well.
The rubbing of the eyelashes against the cornea and the membrane that encloses the eye—conjunction—can lead to excessive tearing, crushing of eyelid, sandy feeling, pain when exposed to bright light, and blurring of vision.

In complicated cases, if cataract involves, it is advisable to correct the lid abnormality first, before cataract surgery.

Surgery is needed to tighten the lower eyelid and its muscular attachments which will restore some of its elasticity and to reposition it.

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