What is the contact disease of the eye that can lead to blindness?

Trachoma is an infectious disease caused by the bacterium Chlamydia trachomatis and is known for its potential to lead to blindness if left untreated. It primarily spreads through direct contact with infected individuals or contaminated surfaces, making it a significant concern in areas with limited sanitation and healthcare access.

Trachoma can cause repeated irritation and inflammation of the conjunctiva, leading to scarring of the inner eyelid. This scarring can eventually turn the eyelids inwards, causing the eyelashes to rub against the cornea, a condition called trichiasis. Over time, this mechanical irritation can result in severe complications, including corneal opacification and blindness.

While conjunctivitis, glaucoma, and blepharitis are also eye conditions, they do not carry the same risk for blindness as trachoma. Conjunctivitis, or "pink eye," is generally self-limiting and rarely causes long-term damage. Glaucoma involves increased intraocular pressure and can lead to vision loss, but it is not primarily a contact disease. Blepharitis is an inflammation of the eyelid margins and is uncomfortable but usually does not lead to blindness. Thus, trachoma stands out as the contact disease of the eye specifically