Ectropion is an abnormal eversion (outward turning) of the lid margin away from the globe. Without normal lid globe apposition, corneal exposure, tearing, keratinization of the palpebral conjunctiva, and visual loss may result.
Ectropion usually involves the lower lid and often has a component of horizontal lid laxity.
Treatment is individualized based on the appropriate identification of the etiology.  See the images below.
The pathophysiology depends on the type of ectropion and is discussed within this article.
The prevalence of involutional lower lid ectropion in elderly patients in Brazil has been estimated at 2.9%. 
The primary morbidity is associated with corneal/conjunctival exposure. Tearing may also cause significant patient complaints. Ectropion can adversely affect the patient’s appearance.
In developed countries, age-related involutional ectropion is more common. In sub-Saharan Africa, cicatricial ectropion from trauma is more common. 
No sexual predilection has been described.
Ectropion can affect patients of any age but is most commonly seen in older adults.