Entropion and ectropion are conditions that affect the eyelids. Entropion is often associated with ageing laxity or due to scar tissue from previous eyelid surgery, trauma or infection. Entropion is when the lower or upper eyelid margin turns inward. This causes the eyelashes and skin to rub against the sensitive eye surface, resulting in foreign body pain, discomfort and irritation. It can affect the cornea and cause reduced vision if not treated promptly.
Ectropion, on the other hand, is when the lower eyelid margin turns outward, exposing the inner surface of the eyelid, leading to dryness and irritation of the conjunctiva on the under surface of the eyelid. It often causes watering as the tears cannot drain, and excess tears are produced secondarily to the inflamed conjunctival lining. Ectropion of the eyelid is commonest in the lower eyelid and is due to eyelid laxity of ageing (involutional) or skin scarring pulling the eyelid margin outwards.