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Entropion is an in-turning of the eyelid margin. This usually involves the lower eyelid, but occasionally may affect the upper eyelid. When the eyelid turns inward, the eye lashes can rub against the eye causing pain, irritation and mattering of the eye. If untreated, it can cause corneal ulceration, infection and may lead to visual loss.
Ectropion is an out-turning of the eyelid margin, most commonly occuring on the lower eyelid. Ectropion can cause tearing, redness and irritation as the eye is exposed to wind, dust and dryness. It may also affect the closure of the eyelids. Ectropion can develop with aging, or may be related to previous cosmetic surgery. Bell's Palsey, a nerve condition that affects the muscles of the face, can also cause the upper or lower eyelids to droop,
Entropion and ectropion can occur in one or both eyes, at the same or different times. Both conditions are repaired surgically in an outpatient facility. In most circumstances, the procedure is considered medically necessary, not cosmetic, and as such, may be covered by insurance.