If trichiasis is not actively treated, or is left untreated for a long period of time, it can lead to inflammation of the conjunctiva. If the cornea becomes inflamed, it can severely affect vision. The occurrence of keratitis can lead to the formation of corneal ulcers and corneal perforation, which can result in blindness. Furthermore, even if the keratitis heals, it can cause varying degrees of corneal opacities such as nebula, macula, and leucoma, which also severely affect vision. Another issue is the growth of new blood vessels on the cornea, which decreases corneal transparency and affects vision. Thus, although trichiasis may seem a minor issue, the consequences of not treating it actively can be very severe.