Uveal Flare (Uveitis)

What is Uveal Flare (Uveitis)?

Uveal flare, more commonly referred to as uveitis, is inflammation of the uveal tract—the middle layer of the eye that includes the iris, ciliary body, and choroid. When this tissue becomes inflamed, protein‑rich fluid can leak into the eye’s anterior chamber, creating a “flare” that is visible during a slit‑lamp examination. Uveitis can affect one eye or both and may be acute (sudden onset) or chronic (persisting for months).

Because the uveal tract supplies blood to the retina and helps focus light, inflammation can quickly threaten vision if not recognized and treated. Uveitis accounts for about 10‑15 % of legal blindness in the United States [1].

Common Causes

Uveitis is rarely idiopathic; most cases have an underlying trigger. The following are the most frequently reported causes:

• Autoimmune diseases – such as ankylosing spondylitis, Behçet’s disease, sarcoidosis, and systemic lupus erythematosus.
• Infectious agents – viral (herpes simplex, varicella‑zoster, cytomegalovirus), bacterial (tuberculosis, syphilis), fungal (Candida, Histoplasma), and parasitic (Toxoplasma gondii).
• Trauma – blunt or penetrating eye injury can breach the blood‑ocular barrier.
• Intra‑ocular surgery – cataract extraction, vitreoretinal procedures, or laser treatments may incite inflammation.
• Systemic inflammatory conditions – inflammatory bowel disease, psoriasis, rheumatoid arthritis.
• Masquerade syndromes – intra‑ocular lymphoma or leukemia that mimic inflammatory signs.
• Genetic predisposition – certain HLA types (e.g., HLA‑B27) increase susceptibility.
• Drug‑induced – bisphosphonates, immune checkpoint inhibitors, or certain antibiotics can cause a drug‑related uveitis.
• Idiopathic – in about 20‑30 % of cases no cause is identified despite thorough work‑up.

Associated Symptoms

Uveal inflammation rarely occurs in isolation. Patients often report a combination of the following:

• Eye redness, typically deep red around the cornea.
• Blurred or decreased vision.
• Photophobia (sensitivity to light).
• Pain—often described as a dull ache that worsens with bright light or eye movement.
• Floaters—small specks or cobweb‑like shadows drifting across the visual field.
• Decreased depth perception.
• Dryness or a gritty sensation.
• In advanced cases, swelling of the pupil (iris bombe) or cataract formation.

When to See a Doctor

Because untreated uveitis can lead to permanent vision loss, prompt evaluation is essential. Seek professional care if you notice:

• New or worsening eye redness that does not improve within 24‑48 hours.
• Any loss of vision, even if mild.
• Severe eye pain or pressure.
• Sudden onset of floaters combined with flashes of light.
• Symptoms persisting after an eye injury or recent eye surgery.
• Recurrent episodes of inflammation in the same or both eyes.

Diagnosis

Diagnosing uveitis involves a systematic approach that combines a detailed history, thorough eye exam, and targeted laboratory testing.

1. Clinical Examination

• Visual acuity test – baseline measurement of vision.
• Slit‑lamp biomicroscopy – allows the eye‑care professional to see flare, cells, keratic precipitates, and iris changes.
• Intra‑ocular pressure (IOP) measurement – inflammation can raise or lower pressure.
• Fundus examination – ophthalmoscopy evaluates the retina and choroid for vasculitis, lesions, or lesions from infectious agents.
• Optical coherence tomography (OCT) – imaging that detects macular edema, a frequent complication.
• Fluorescein angiography (FA) or Indocyanine Green Angiography (ICG) – highlight vascular leakage.

2. Laboratory and Imaging Work‑up

Tests are tailored to the suspected underlying cause.

• Complete blood count (CBC) and inflammatory markers (ESR, CRP).
• Serologic tests for infectious agents: VDRL/RPR (syphilis), Quantiferon‑TB Gold (TB), HIV, HSV/VZV PCR.
• Autoimmune panels: ANA, HLA‑B27 typing, rheumatoid factor, angiotensin‑converting enzyme (ACE) for sarcoidosis.
• Chest X‑ray or CT to look for pulmonary sarcoidosis or TB.

3. Classification

Uveitis is categorized based on the anatomy of inflammation:

• Anterior uveitis – inflammation of the iris and ciliary body (most common).
• Intermediate uveitis – vitreous involvement.
• Posterior uveitis – choroid and retina affected.
• Panuveitis – all layers involved.

Treatment Options

Treatment aims to control inflammation, prevent complications, and address the underlying cause. Management typically involves both medication and supportive measures.

Medical Therapy

• Topical corticosteroids (e.g., prednisolone acetate 1%) – first‑line for anterior uveitis.
• Cycloplegic agents (e.g., homatropine, atropine) – relieve pain from ciliary spasm and prevent synechiae.
• Systemic corticosteroids – oral prednisone or IV methylprednisolone for intermediate, posterior, or severe anterior uveitis.
• Immunomodulatory therapy (IMT) – methotrexate, mycophenolate mofetil, azathioprine, or biologics (adalimumab, infliximab) for chronic or steroid‑sparing needs.
• Antimicrobial therapy – targeted antibiotics/antivirals/antifungals when an infectious etiology is identified (e.g., oral azithromycin for toxoplasmosis, anti‑TB regimen for tuberculosis).
• Intravitreal injections – corticosteroid implants (e.g., Ozurdex) or anti‑VEGF agents for macular edema secondary to uveitis.

Home & Lifestyle Measures

• Apply prescribed eye drops exactly as directed; never skip doses.
• Use a cool, damp compress on the closed eyelid to reduce discomfort.
• Wear sunglasses with UV protection to lessen photophobia.
• Avoid contact lenses until the inflammation resolves.
• Maintain good control of systemic diseases (e.g., arthritis, inflammatory bowel disease) in collaboration with your primary physician.
• Stay up‑to‑date with vaccinations—especially for preventable infections like varicella and influenza that can trigger uveitis.

Prevention Tips

While not all cases are preventable, risk can be lowered by addressing modifiable factors:

• Manage systemic autoimmune conditions with regular rheumatology follow‑up.
• Promptly treat infections; complete full courses of antibiotics or antivirals.
• Practice eye safety: wear protective eyewear during sports, construction work, or when handling chemicals.
• Avoid smoking, which is linked to a higher incidence of ocular inflammation.
• Regular ophthalmic examinations for patients with known risk factors (HLA‑B27 positivity, prior uveitis, sarcoidosis, etc.).
• Discuss medication side‑effects with your doctor; some drugs may need substitution if they provoke inflammation.

Emergency Warning Signs

Key Take‑aways

Uveal flare (uveitis) is a potentially sight‑threatening inflammation that often signals a systemic disease or infection. Early recognition, comprehensive evaluation, and prompt, tailored treatment are essential to preserve vision and prevent complications such as cataract, glaucoma, or permanent retinal damage.

Always follow up with an ophthalmologist or eye‑care specialist, especially if symptoms recur or do not improve within a few days of treatment.

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Sources:

1. Mayo Clinic. “Uveitis.” Updated 2023. https://www.mayoclinic.org
2. American Academy of Ophthalmology. “Uveitis” Clinical Practice Guidelines, 2022.
3. National Eye Institute (NEI). “Uveitis – Facts and Statistics.” 2022.
4. World Health Organization. “Blindness and Vision Impairment.” 2021.
5. Jabs DA, et al. “Standardization of Uveitis Nomenclature (SUN) Working Group.” *Ophthalmology*, 2020.