Trachoma: Definition, Causes and Treatment
Trachoma is a serious bacterial infection of the eyes and one of the top causes of blindness in the world. The infection is rare in the United States, though it’s a common public health problem in 44 countries.
In the early stages of infection, trachoma can be cured with antibiotics, but people going through the later stages of the disease may require surgery as well.
It’s important to diagnose and treat trachoma promptly, as chronic trachoma infection can cause scarring on the eyelids and lead to irreversible blindness or vision loss.
Trachoma causes and prevention
Trachoma is caused by the highly contagious Chlamydia trachomatis bacteria. This bacteria is transmitted by direct or indirect contact with bodily fluids from the eye, nose or mouth of someone who is infected.
Some of the most common ways trachoma is transmitted include the following:
Kissing, hugging or any face-to-face contact
Sharing bedding, clothing or face towels
Coming in contact with certain flies that spread the bacteria
Handling a contaminated object and then touching your face
Because it can cause irreversible blindness, trachoma prevention is a serious public health issue. This requires available eye exams and medical treatment, access to clean drinking and bathing water, and fly control and waste management. In general, good hygiene practices, including face and hand washing, may help prevent trachoma infection.
SEE RELATED: Chlamydial conjunctivitis
Trachoma symptoms typically start between five and 12 days after contracting the infection. Common symptoms include:
Eye itching and irritation
Eyelid swelling and inflammation
Eye discharge, redness or pain
Blurry vision or loss of vision
Light sensitivity (photophobia)
It's impossible to tell just based on symptoms whether someone has trachoma, as symptoms are quite similar to those of other eye conditions, such as conjunctivitis (pink eye).
An eye doctor can diagnose trachoma by doing an eye exam and possibly sending a fluid sample from the eye to a laboratory for trachoma testing.
Your doctor will also consider your risk factors for trachoma — for instance, if you have recently traveled to one of the places where trachoma is common. Trachoma is prevalent in impoverished and more rural areas in Africa, Asia, Australia, Central and South America and the Middle East, where crowded living conditions and poor hygiene due to limited (or no) access to clean water can put people at risk of spreading infection.
Age may also play a role, since children ages 4 to 9 are more likely to get trachoma infection than teenagers and adults.
Stages of trachoma infection
Trachoma infection has five distinct stages, but those who are treated early will not progress through all of them. The stages of trachoma are:
Trachoma stage 1 — Trachoma starts with follicular inflammation, meaning small bumps (follicles) form on the inner surface of your upper eyelid. These bumps are filled with white blood cells (lymphocytes). Having five or more of these follicles, which an eye doctor can see with magnification, is a sign of trachoma.
Trachoma stage 2 — This is characterized by intense inflammation. The eye becomes irritated and the eyelid swells. Your eye (or eyes) may begin to ooze discharge. Trachoma infection is very contagious at this stage.
Trachoma stage 3 — Eyelid scarring occurs in this stage. After the infection becomes chronic, or if there’s been recurring infections over time, the top inner eyelid develops bands of scarring that can begin to cause changes in the eyelid. The eyelid may even begin to turn inward (entropion).
Trachoma stage 4 — In this advanced stage, changes in the eyelid continue and scar tissue pulls the eyelids tight. This forces the eyelashes to grow inward (trichiasis), rubbing against the conjunctiva (the clear, thin membrane that covers the front surface of the eye), the cornea and possibly the inside of the eyelid, leading to irritation and pain. If not treated, trichiasis can lead to irreversible blindness. Along with trachoma, trichiasis can result from blepharitis, herpes of the eye, trauma and other types of eye infections.
Trachoma stage 5 — The final stage involves corneal cloudiness or opacity. As eyelashes continue to rub against and irritate the cornea, you may rub your eyes due to discomfort from the condition. Repeated trauma to the cornea may cause corneal ulcers and scarring of the cornea. Over time, this scarring results in opacity of the cornea that blocks light and leads to blindness.
Ideally, those affected can receive trachoma treatment before stage three (eyelid scarring), which will help them recover with no changes to eye anatomy and no vision loss.
The two most common treatments for trachoma are antibiotics and trachoma surgery. Treatment will vary, depending on the stage of infection. In general, if detected early, antibiotics can sufficiently knock out trachoma and help prevent further spread of this infection, while more chronic cases may require antibiotics and a surgical procedure.
Antibiotics for trachoma
Treatment with antibiotics can easily and quickly cure trachoma infection in the early stages. The antibiotic typically used for trachoma treatment is azithromycin; this is given to young children as a syrup and to older kids and adults in the form of tablets.
In some areas where trachoma is widespread, a whole community can be treated at the same time as a preventative measure to stop the spread of the disease from person to person, according to the World Health Organization (WHO).
If trachoma goes untreated and turns into a chronic condition, those affected may develop eyelid scarring that, in turn, progresses to trichiasis (eyelashes turning inward).
Treatment of severe trachoma may involve several phases, starting with prescription antibiotics to clear up any active infection, and followed by trachoma surgery — and possibly eyelash removal — to stop eyelashes from scraping against the cornea and prevent vision loss.
People with severe untreated trachoma (or recurring infections) may develop serious changes to the anatomy of their eyelids that can require trachoma surgery.
There are two main types of procedures performed on people in the later stages of trachoma. These are:
Eyelid rotation (tarsal rotation surgery) — One common trachoma surgery is an eyelid rotation procedure used to treat trachomatous trichiasis (inward eyelashes) and prevent vision loss. This trachoma surgery involves making an incision in the scarred upper eyelid, rotating part of the eyelid away from the eye and using sutures to hold the eyelid in the new position.
Eyelash removal — Some people may require removal of the eyelashes — this may also need to be done repeatedly after eyelashes grow back. Procedures used to remove eyelashes include cryotherapy (removal by freezing), electrolysis (removal with a probe and electrical charge) and eyelash epilation (removal with forceps). Eyelash removal may be done in a doctor's office with local anesthetic eye drops.
It’s important to note that trachoma surgery cannot reverse vision loss or blindness, if either occurs. In order to preserve eyesight, surgery must be done before any vision loss occurs. In some cases, trichiasis can come back after surgery, which may require an additional procedure.
See an eye doctor for trachoma symptoms
Regular eye exams can help detect trachoma, as well as other more common eye issues like myopia and glaucoma — though access to medical care is admittedly limited in impoverished countries where trachoma is more likely to occur, making prevention efforts more difficult.
Luckily, the prognosis is good if the infection is caught early and the infected person receives trachoma treatment before any lasting damage is done to the eyelids and corneas.
If you have trachoma symptoms, or if it's been a while since you had your eyes checked, be sure to plan a visit with an eye doctor for a comprehensive eye exam.
READ MORE: Follicular Conjunctivitis
Page published on Wednesday, February 3, 2021