Trachoma is a chronic infectious conjunctivitis and keratitis caused by Chlamydia trachomatis, which can lead to blindness if left untreated. After the acute phase of trachoma is cured, it may leave no scars and not affect vision. However, repeated infections can lead to scarring, and in severe cases, complications may endanger vision. Entropion and trichiasis, where eyelashes constantly rub against the cornea, can cause the cornea to become opaque and form ulcers, leading to blindness. Chlamydia trachomatis can cause epithelial keratitis, and at the ends of corneal vascular pannus, corneal infiltration can occur along with entropion and trichiasis, which in turn exacerbates the damage to the cornea, causing opacification and leading to blindness.