There are several conditions that may cause the eyelid to become incorrectly positioned. Beyond the aesthetic factor, these malpositions usually need to be corrected because they can result in decreased vision and irritation of the eye. The major causes of eyelid malpositioning are:
- Ptosis - Ptosis is a condition in which the eyelid droops. It is caused by a weakness or separation of muscles deep within the eyelid. Ptosis does not involve excess skin or tissue in the eyelid. It is usually a result of aging, but some people develop ptosis after eye surgery or an injury, and some children are born with the condition. A brief surgical procedure can eliminate the drooping by lifting the eyelid and reattaching it to a higher location on the face. Patients who are also suffering from excess skin may choose to undergo blepharoplasty at the same time as ptosis repair.
- Entropion - Entropion is a "turning in" of the eyelid. The lid and lashes rub painfully against the cornea. Entropion usually occurs as a result of aging, but other causes can include injury, congenital defect and various inflammatory conditions. A spasm can cause the lid to turn inward as well. Entropion can be corrected with a brief surgical procedure under local anesthesia.
- Ectropion - Ectropion is a "turning out" of the eyelid that causes redness, irritation, tearing and an increased likelihood of infection. Common causes of ectropion include aging, sun damage, tumors, burns and the removal of too much skin during blepharoplasty. Over time, if the condition is not treated, the cornea may become damaged due to abrasions, ulcers or infections, resulting in some loss of vision.
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