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Iridocyclitis: Causes, Symptoms & Treatment

Iridocyclitis is an inflammation of the iris and the ciliary body of the eye. It is classified as anterior uveitis and requires prompt medical treatment.

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Things worth knowing about "Iridocyclitis"

Iridocyclitis is an inflammation of the iris and the ciliary body of the eye. It is classified as anterior uveitis and requires prompt medical treatment.

What is Iridocyclitis?

Iridocyclitis is a condition characterized by simultaneous inflammation of the iris (the colored part of the eye) and the ciliary body, which is responsible for producing the fluid inside the eye. Both structures are part of the middle layer of the eye, known as the uvea. Because the inflammation occurs in the front portion of the eye, iridocyclitis is also referred to as anterior uveitis. It is the most common form of uveitis and can affect one or both eyes.

Causes

Iridocyclitis can result from a variety of underlying causes:

Autoimmune conditions: Diseases such as ankylosing spondylitis, rheumatoid arthritis, or sarcoidosis are frequently associated with iridocyclitis.
Infections: Viral infections (e.g., herpes simplex, herpes zoster), bacterial infections (e.g., tuberculosis, Lyme disease), or parasitic infections can trigger inflammation.
Idiopathic: In many cases, no identifiable cause is found.
Trauma: Eye injuries or surgical procedures can lead to iridocyclitis.
Systemic inflammatory diseases: Conditions such as Crohn's disease or ulcerative colitis may be associated with ocular inflammation.

Symptoms

Common symptoms of iridocyclitis include:

Eye pain, which may worsen with exposure to light
Photophobia (sensitivity to light)
Redness of the eye, particularly around the cornea (ciliary injection)
Blurred vision or reduced visual acuity
Excessive tearing
Constriction of the pupil (miosis) and irregular pupil shape due to adhesions (posterior synechiae)

Symptoms may appear suddenly in acute cases or develop gradually in chronic forms, where they may be milder but persistent.

Diagnosis

Diagnosis is made by an ophthalmologist and typically involves:

Slit-lamp examination: Allows direct visualization of inflammatory cells and the Tyndall effect (cloudiness of aqueous humor) in the anterior chamber of the eye.
Intraocular pressure measurement: Inflammation can alter eye pressure, leading to increased or decreased levels.
Laboratory tests: Blood tests, HLA-B27 typing, or pathogen detection may be performed when a systemic cause is suspected.
Imaging: X-ray or MRI may be used to rule out associated systemic diseases.

Treatment

Treatment depends on the underlying cause and severity of the inflammation:

Corticosteroids: Topical eye drops or ointments containing corticosteroids are the first-line treatment to reduce inflammation.
Mydriatics: Pupil-dilating eye drops (e.g., atropine) help prevent adhesions between the iris and lens (posterior synechiae) and relieve pain.
Systemic therapy: In severe or chronic cases, systemic corticosteroids, immunosuppressants, or biologic agents may be required.
Treatment of the underlying condition: If an infectious or systemic cause is identified, targeted treatment is essential.

Early treatment is crucial to prevent serious complications such as glaucoma, cataracts, or permanent vision loss.

Prognosis

Iridocyclitis may follow an acute, recurrent, or chronic course. With timely and consistent treatment, acute episodes usually resolve completely. Chronic forms require long-term medical management. If left untreated, the condition can lead to significant and lasting visual impairment.

References

Jabs DA, Nussenblatt RB, Rosenbaum JT - Standardization of Uveitis Nomenclature (SUN) Working Group. American Journal of Ophthalmology, 2005.
Heiligenhaus A. et al. - Uveitis: Diagnostics and Therapy. Deutsches Aerzteblatt, 2020.
Forrester JV, Dick AD, McMenamin PG et al. - The Eye: Basic Sciences in Practice. 4th edition, Elsevier, 2016.

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