A18.5 Tuberculosis of eye

Name of the Condition

• Tuberculosis of eye
• ICD Code: A18.5

Summary

Tuberculosis of the eye is a rare form of extrapulmonary tuberculosis where Mycobacterium tuberculosis infects ocular structures. This condition occurs when TB bacteria spread from a primary site, typically the lungs, to the eye via the bloodstream or lymphatic system. It can affect various parts of the eye, including the uvea, retina, or cornea, and may lead to vision impairment if not promptly diagnosed and treated.

Causes

Tuberculosis of the eye is caused by the dissemination of Mycobacterium tuberculosis from an existing infection, usually pulmonary tuberculosis. The bacteria can travel to the eye during active disease or reactivation of latent TB. Direct inoculation is rare but possible in certain cases.

Risk Factors

• Immunocompromised states, such as HIV/AIDS or chronic immunosuppressive therapy.
• History of untreated or inadequately treated tuberculosis.
• Close contact with individuals who have active TB.
• Living in or traveling to regions with high TB prevalence.
• Underlying conditions like diabetes or malnutrition.

Symptoms

• Redness and swelling in the eye.
• Decreased vision or blurred vision.
• Eye pain and sensitivity to light (photophobia).
• Floaters or seeing spots.
• Discharge or tearing.

Diagnosis

Diagnosis involves a comprehensive eye examination, tuberculin skin test (Mantoux test) or Interferon-Gamma Release Assays (IGRA), chest X-ray to detect pulmonary tuberculosis, ocular imaging methods such as optical coherence tomography, and microbiological tests like polymerase chain reaction (PCR) for ocular fluid analysis.

Treatment Options

• Antitubercular therapy (ATT) is the primary treatment to eliminate the infection.
• Corticosteroids may be prescribed to reduce inflammation.
• Surgical intervention may be necessary in severe cases.

Prognosis and Follow-Up

Prognosis depends on early diagnosis and adherence to treatment. Most patients respond well to therapy, but vision loss can occur if the condition is advanced. Regular follow-up with an ophthalmologist and infectious disease specialist is essential to monitor for recurrence or complications.

Complications

• Permanent vision loss.
• Chronic eye inflammation.
• Cataracts or glaucoma.
• Retinal detachment.

Lifestyle & Prevention

• Avoid close contact with individuals who have active TB.
• Ensure proper ventilation in living or working spaces.
• Maintain a healthy immune system through balanced nutrition and regular exercise.
• Follow public health guidelines for TB screening and prevention in high-risk areas.

When to Seek Professional Help

Seek immediate medical attention if you experience sudden vision changes, severe eye pain, or persistent redness and swelling. Early intervention is critical to prevent permanent damage.

Tips for Medical Coders

Document the specific ocular structure affected (e.g., uvea, retina) and confirm the diagnosis with clinical findings or microbiological tests. Ensure the code aligns with the patient's documented condition and treatment plan.