Entropion is a condition in which the eyelid is rolled inward toward the eye. It can occur as a result of advancing age and weakening of certain eyelid muscles. Entropion may also occur as a result of trauma, scarring, or previous surgeries. A turned in eyelid rubs against the eye, making it red, irritated, painful, and sensitive to light and wind. If it is not treated the condition can lead to excessive tearing, mucous discharge and scratching or scarring of the cornea. A chronically turned in eyelid can result in acute sensitivity to light and may lead to eye infections, corneal abrasions, or corneal ulcers. If entropion exists, it is important to have it surgically repaired before permanent damage to the eye occurs.