Ectropion occurs when the lower eyelid turns outward. Since this reveals too much of the eye and delicate tissue within the lid, it is important to seek treatment to avoid eye damage and vision loss. Symptoms of an ectropion lid are stinging sensation, moderate to severe tear production, and chronic red eyes. Previous trauma to the eyelid, weakening muscles around the eye, a damaged facial nerve, or chronic infection are factors that can cause ectropion.