Which of the following describes the condition where eyelashes grow inward, causing eye irritation?

The condition where eyelashes grow inward, causing eye irritation, is known as Trichiasis. This occurs when the eyelashes do not grow in the normal outward direction but instead curl inward towards the eye. This misalignment can lead to various discomforts, such as irritation of the cornea and conjunctiva, due to constant contact with the eye surface. In serious cases, it can result in inflammation, infections, and even damage to the eye if left untreated.

Understanding Trichiasis is crucial for lash professionals as it emphasizes the importance of proper eyelash alignment and care. Unlike other conditions listed, such as Madarosis, which refers to the loss of eyelashes, or a Corneal ulcer, which is a severe eye condition resulting from infections or injuries, Trichiasis specifically deals with the misdirection of eyelashes itself, leading directly to irritation and discomfort.