Entropion is the medical term used to describe rolling inward of the lower eyelid and eyelashes towards the eye. The skin of the eyelid and the eyelashes rub against the cornea (the front part of the eye) and conjunctiva (the mucous membrane that protects the eye). This rubbing can lead to excessive tearing, crusting of the eyelid, mucous discharge, a feeling that something is in the eye, irritation of the cornea, and impaired vision.

Most cases of entropion are due to relaxation of the tissues of the eyelid as a result of the aging process. Some cases result from scarring of the inner surface of the eyelid caused by chemical and thermal burns, inflammatory diseases such as ocular pemphigoid, or allergic reactions. Rarely, entropion can be present at birth if the eyelids do not develop properly.

Entropion should be repaired surgically before the rubbing damages the cornea by causing infection and scarring. Prior to surgery, the eye can be protected by taping the lower lid down and using lubricating drops and ointment. In some cases, sutures can be placed through the lower eyelid until more definitive surgery can be performed. The surgery to repair entropion is usually performed under local anesthesia as an outpatient.