Also known as "eyelash inversion," it is a condition caused by improper treatment of palpebral margin inflammation (blepharitis) or "prickly-ash-like sore (trachoma)," leading to persistent curling of the eyelashes. Due to the eyelashes irritating the eyeball, patients experience symptoms such as astringent pain, tearing, and photophobia. In severe cases, it may even lead to superficial corneal ulcers, eventually forming a cloudy nebula.