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

Entropion is the condition where the eyelid, specifically the lower eyelid, turns inward, causing the eyelashes to rub against the surface of the cornea. This can lead to irritation, discomfort, and potential damage to the eye if not treated. The inward rolling of the eyelashes can cause persistent tearing, redness, and sensitivity to light due to the constant friction against the cornea.

In contrast, ectropion refers to the outward turning of the eyelid, which does not involve eyelashes rubbing against the cornea. Blepharitis is an inflammation of the eyelid margins that can affect the eyelashes, but it does not necessarily involve rolling inwards. Ptosis is the drooping of the eyelid, which also does not pertain to the condition of the eyelashes rolling inward. Understanding these differences helps clarify why entropion is the correct answer to the question about eyelashes rolling in and rubbing against the cornea.