What term describes the outward turning of an eyelid so that it no longer rests against the eyeball?

The term that describes the outward turning of an eyelid so that it no longer rests against the eyeball is ectropion. This condition typically affects the lower eyelid, leading it to sag away from the eye. As a result, the inner surface of the eyelid is exposed, which can cause discomfort and increase the risk of dry eye or irritation due to the lack of contact with the eyeball.

Other terms relate to different eyelid issues: entropion is the inward turning of the eyelid, which causes the eyelashes to rub against the eyeball, leading to irritation and potential corneal damage. Ptosis refers to the drooping or falling of the upper eyelid, which can obstruct vision. Blepharitis is an inflammation of the eyelid margins, often due to a bacterial infection or seborrheic dermatitis, and is not specifically about the position of the eyelid in relation to the eyeball. Each of these conditions affects eyelids but in ways distinct from ectropion.