A bacterial infection that affects the eyes.

Trachoma is the leading preventable cause of blindness worldwide. It's caused by the bacterium Chlamydia trachomatis. Infection is spread through personal contact and by flies that have been in contact with discharge from the eyes or nose of an infected person. Trachoma is very contagious.

Trachoma almost always affects both eyes. Symptoms begin with mild itching and irritation of the eyes and eyelids. Symptoms may worsen to blurred vision and eye pain related to long-lasting inflammation and scarring.

Antibiotics treat early-stage trachoma. Surgery is needed in later stages. Access to clean water and improved sanitation is key to prevention.