What is the condition where the eyelashes roll in and rub against the cornea?

The condition where the eyelashes roll in and rub against the cornea is known as entropion. This condition causes the eyelids, particularly the lower eyelids, to turn inward, leading to the eyelashes making contact with the surface of the eye. This can result in irritation, discomfort, and potentially serious complications such as corneal abrasion or infection due to constant friction.

Entropion may occur due to aging, scarring from previous injuries, or congenital issues. The inward rolling of the eyelids is significant because the lashes, being in constant contact with the cornea and conjunctiva, can cause significant discomfort and damage to the ocular surface.

The other conditions listed have distinct characteristics that differentiate them from entropion. Ectropion, for example, involves the eyelids rolling outward rather than inward, which does not cause the same rubbing effect on the cornea. Blepharitis refers to inflammation of the eyelid margins, and while it can cause irritation, it does not specifically involve the eyelashes rolling inward. Ptosis is the drooping of the upper eyelid and does not relate to the mispositioning of eyelashes. Each of these conditions affects the eyelids differently, but entropion directly relates to the inward turning of the