This is when the edge of the eyelid (most often the lower eyelid) folds or inverts towards the surface of the eye. The contact and even more the rubbing of the eyelashes cause irritation and with time, ulceration and scarring of the cornea. It is caused by genetic factors, is the opposite of ectropion, and should not be confused with trichiasis.

Treatment: it is important to determine the cause that has caused it. In moderate and severe cases, a surgical procedure is usually chosen by which the eyelids are placed in the correct position.