Trachoma is a prolonged infection of the conjunctiva caused by the bacterium Chlamydia trachomatis.
Chlamydia trachomatis can infect the eye, usually in children who live in lesser-developed, hot, dry countries.
Eye redness, watering, irritation, and if severe, scarring and loss of vision may develop.
Antibiotics are effective, but re-infection is common.
Trachoma results from infections with certain nonsexually transmitted strains of Chlamydia trachomatis. Trachoma is common in dry, hot countries in North Africa, the Middle East, the Indian subcontinent, Australia, and Southeast Asia. In the United States, trachoma is rare, occurring occasionally among American Indians and among immigrants from areas where trachoma is common. Trachoma is the leading preventable cause of blindness in the world.
An Inside Look at the Eye
The disease occurs mainly in children, particularly those between the ages of 3 and 6. Older children and adults are much less likely to have the disorder because of increased immunity and better personal hygiene.
Trachoma is contagious in its early stages and may be transmitted by eye–hand contact, by flies, or by sharing contaminated articles, such as towels, handkerchiefs, and eye makeup.
Symptoms of Trachoma
Trachoma usually affects both eyes. The conjunctivae (the membranes that line the eyelid and cover the white of the eye) become inflamed, red, and irritated, and the eyes water excessively. The eyelids swell. Sensitivity to bright light occurs.
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In the later stages, blood vessels may gradually grow across the cornea (called neovascularization), obstructing vision. In some people, the eyelid is scarred in such a way that the eyelashes turn inward (trichiasis). As the person blinks, the eyelashes rub against the cornea, causing infection and often permanent damage. Impaired vision or blindness occurs in about 5% of people with trachoma.
Diagnosis of Trachoma
A doctor's evaluation of the symptoms and appearance of the eye
Doctors suspect trachoma based on the appearance of the eyes and on the duration of symptoms. The diagnosis of trachoma can be confirmed by swabbing the eye and sending the sample to a laboratory, where the infecting organism is identified, but often such testing is not necessary because the diagnosis is clear.
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Treatment of Trachoma
Antibiotics taken by mouth or applied as ointment
Prevention of Trachoma
Because trachoma is contagious, reinfection commonly occurs. Access to water that is suitable for drinking (potable) can reduce reinfection. Regular hand and face washing helps prevent spread. Sharing towels, washcloths, bedding, and eye makeup should be avoided. Because flies can transfer the disease among people, places where flies can breed should be eliminated.
More Information
The following English-language resource may be useful. Please note that THE MANUAL is not responsible for the content of this resource.
Centers for Disease Control and Prevention, Hygiene-related Diseases: Trachoma-related information on everything from the basics of what it is to the World Health Organization's ongoing plans to eliminate it. Links to more resources are also provided.
