Conjunctivitis caused by Chlamydia trachomatis infection is called trachoma for short. It is an infectious disease in itself. This type of disease is most common in young people and children under 20 years of age, and the obvious acute symptoms are often in younger children, but only after 20 years of age do they lead to significant complications that get progressively worse with age. The onset is usually simultaneous in both eyes, and if there is a significant infection, most patients will have symptoms of conjunctivitis, such as tearing, photophobia, foreign body sensation, and increased discharge from the eyes. This condition tends to last longer than common bacterial and viral conjunctivitis, and an examination may reveal significant ocular redness, follicular and papillary hyperplasia under the slit lamp. As the infection lengthens, scarring of the conjunctiva and corneal rim becomes evident, especially in the case of the characteristic corneal vascular opacity. This type of disease can lead to several types of complications, such as the development of lid entropion and, in severe cases, corneal ulcers, which are likely to be irreversible, with the ultimate outcome being corneal transplantation. Trachoma is a type of disease that can cause significant damage to the eye, so it is crucial to improve environmental hygiene and ensure eye hygiene.