Clinical Guides
Uveitis
A clinically focused guide to anatomical classification, urgent assessment and cause-directed management of uveitis in India, with explicit infection and ocular-tuberculosis safeguards and specialist ownership of corticosteroid or immunomodulatory treatment.
MedNext Academy | 13 min read
Uveitis
A clinically focused guide to anatomical classification, urgent assessment and cause-directed management of uveitis in India, with explicit infection and ocular-tuberculosis safeguards and specialist ownership of corticosteroid or immunomodulatory treatment.
Summary
Uveitis denotes intraocular inflammation and is classified anatomically by the site where inflammation predominates: anterior uveitis, intermediate uveitis, posterior uveitis and panuveitis. The label is a starting description, not a final aetiological diagnosis. Disease may be infectious, immune-mediated, associated with systemic illness, triggered by trauma or surgery, drug-related, or a masquerade such as intraocular lymphoma. Treating every painful red eye as anterior uveitis is unsafe, and treating unexplained inflammation with corticosteroid before considering infection can threaten sight and life.
Anterior uveitis commonly causes pain, photophobia, redness and blur, with anterior-chamber cells and flare on slit-lamp examination. Intermediate disease often presents with floaters and reduced vision from vitreous inflammation or macular oedema. Posterior inflammation can involve retina, choroid, retinal vessels or optic nerve and may be relatively painless despite severe visual threat. Panuveitis involves multiple compartments. Standardized description records laterality, onset, duration, course and activity, while the eventual diagnosis integrates morphology, systemic history, imaging and targeted laboratory investigation.
Management suppresses damaging inflammation, treats a proven or sufficiently supported cause and prevents complications including synechiae, cataract, glaucoma, macular oedema, retinal damage and hypotony. Topical, local or systemic corticosteroid and noncorticosteroid immunomodulatory therapy require ophthalmic monitoring; antimicrobial treatment is organism- and syndrome-specific. This draft is educational, reviewed and has been reviewed by the MedNext Clinical Team, not a substitute for examination by an ophthalmologist experienced in ocular inflammation.
How Common Is It?
Uveitis is less common than conjunctivitis or cataract but contributes disproportionately to visual disability because it often affects working-age people, can recur and may damage the macula, optic nerve or whole eye. Frequency estimates depend on whether a study counts episodes or people, includes only tertiary clinics, separates infectious from noninfectious disease and uses standardized anatomical definitions. Referral-centre series overrepresent severe posterior disease, while community surveys may miss quiet chronic inflammation. A single international prevalence figure should therefore not be presented as the current rate for all of India.
The mixture of causes changes by geography, age, immune status and diagnostic capacity. Anterior uveitis is the most commonly encountered anatomical category in many clinical series. In children it may be asymptomatic, particularly with juvenile idiopathic arthritis, so symptoms alone understate disease. In regions with more tuberculosis exposure, tubercular phenotypes enter the differential more often, but a positive immune test does not prove that ocular inflammation is caused by Mycobacterium tuberculosis. Toxoplasmosis, viral anterior uveitis and other infections also vary by population.
Burden should be measured through visual outcome, recurrence, steroid dependence, complication rate, delayed presentation and loss to follow-up, not simply clinic attendance. India lacks one uniformly applicable service dataset covering every state and care sector. Local audit should document anatomical class, suspected cause, tests obtained, time to uveitis or retina review, treatment toxicity and completion of infectious work-up. For individual care, the important principle is that apparently mild inflammation can recur or leave structural damage without systematic follow-up.
Risk Factors
A previous episode is a strong clue because several uveitic syndromes recur. Ask about HLA-B27-associated spondyloarthritis, inflammatory bowel disease, psoriasis, juvenile idiopathic arthritis, sarcoidosis, Behcet disease and other systemic inflammatory disorders. Pattern matters: a sudden unilateral recurrent anterior attack differs from chronic bilateral silent inflammation in a child. Family history may support an associated systemic disorder but does not diagnose ocular inflammation. Pregnancy and the postpartum period can change activity in selected noninfectious conditions and require coordinated medicine review.
Infectious risk assessment is essential. Record tuberculosis exposure or treatment, immunosuppression, HIV risk, syphilis risk, travel, animal and food exposure, shingles or cold sores, previous toxoplasmosis and systemic febrile illness. Ocular surgery, intravitreal injection, penetrating trauma or a retained foreign body raises concern for exogenous infection. Contact-lens wear points more toward keratitis but remains relevant in a painful photophobic red eye. Never infer ocular tuberculosis solely from residence, chest imaging or an immune response test.
Medicines can trigger uveitis-like inflammation, and current treatment changes the differential. Ask about checkpoint inhibitors, selected antimicrobials, bisphosphonates and other temporally related agents without stopping essential therapy unsafely. Existing corticosteroid or biologic use can partially mask infection. Lens material, intraocular lenses and postoperative syndromes can sustain inflammation. Children, pregnant patients, people with only one useful eye and those with diabetes or glaucoma face particular consequences from disease or treatment. Risk factors guide targeted investigation; broad indiscriminate panels generate false positives and do not replace phenotype-based reasoning.
Diagnosis
History
Define onset, laterality, duration, recurrence and whether pain, consensual photophobia, redness, floaters, field change or central blur dominates. Ask about prior episodes, eye surgery, injection, trauma, contact lenses and current drops. Review joint or back pain, rash, oral or genital ulcers, bowel symptoms, cough, fever, weight loss, neurological symptoms and pregnancy. Document infection exposures, immune status and all corticosteroid or immunomodulatory treatment. Sudden profound loss, severe pain or recent procedure increases emergency urgency.
Examination
Measure monocular acuity, pupils and intraocular pressure, then examine the cornea, anterior chamber, iris and lens at the slit lamp. Record keratic precipitates, cells and flare using a consistent grading system, fibrin, hypopyon, posterior synechiae and iris atrophy. Dilated examination assesses vitreous cells or haze, macula, optic disc, retinal vessels, retinitis, choroiditis and peripheral retina. Check both eyes even when symptoms are unilateral. Corneal staining, reduced corneal sensation or a focal infiltrate may redirect diagnosis toward infection.
Investigations
Tests are selected from the anatomical pattern and suspected syndrome. Optical coherence tomography detects macular oedema and selected choroidal changes; fundus photography and angiography document posterior lesions, leakage or vasculitis; ultrasonography helps when media opacity blocks the view. Laboratory studies may include syphilis and tuberculosis assessment, chest imaging, HLA-B27 or other targeted tests, but no universal panel fits every case. Aqueous or vitreous sampling for microbiology, polymerase-chain-reaction testing or cytology is specialist-led when infection or masquerade is plausible. Results must be interpreted with phenotype and pre-test probability.
Differential Diagnosis
Conjunctivitis causes surface redness and discharge but usually not true anterior-chamber cells, marked consensual photophobia or sustained visual reduction. Microbial keratitis produces a corneal epithelial defect and infiltrate, sometimes with secondary anterior-chamber reaction; missing the corneal focus and giving steroid can accelerate infection. Scleritis often causes deep severe pain and violaceous injection and may coexist with uveitis. Acute angle closure causes pain, haloes, nausea, a shallow chamber, corneal oedema, mid-dilated pupil and high pressure. Pressure in uveitis can be low, normal or high, so tonometry supports rather than defines the diagnosis.
Postoperative or post-injection endophthalmitis must be considered with pain, redness, visual loss, hypopyon or dense vitritis. Retained lens material, toxic anterior-segment syndrome and intraocular-lens-related inflammation require procedural history and urgent specialist assessment. Herpetic anterior uveitis may show unilateral pressure rise, iris atrophy and corneal disease. HLA-B27 disease, juvenile idiopathic arthritis, sarcoidosis, Behcet disease, inflammatory bowel disease and drug reactions are noninfectious possibilities; syphilis, tuberculosis, toxoplasmosis, herpes viruses and fungal disease are important infectious causes.
Posterior mimics include retinal detachment, vascular occlusion, central serous chorioretinopathy and degenerative white-dot-like lesions. Masquerade syndromes include vitreoretinal lymphoma, leukaemic infiltration, retinoblastoma in a child and pigment dispersion after a retinal tear. Floaters plus cells are not automatically intermediate uveitis. Persistent, atypical, treatment-resistant, unilateral or older-onset inflammation should reopen the diagnosis, verify adherence and exposure, repeat posterior examination and consider infection or neoplasia before simply escalating immunosuppression.
Management
The first management decision is whether infection, postoperative endophthalmitis or another emergency is plausible. If so, arrange immediate specialist sampling and antimicrobial management rather than masking signs with empirical corticosteroid alone. For noninfectious anterior uveitis, ophthalmologists commonly use topical corticosteroid to suppress inflammation and a cycloplegic or mydriatic to relieve ciliary spasm and reduce posterior synechiae. Choice and taper depend on cell activity, pressure, corneal status, cause and response; a fixed schedule copied from an article is unsafe.
Intermediate, posterior and panuveitis often require local injection or implant, systemic corticosteroid, noncorticosteroid immunomodulatory therapy, cause-specific biologic therapy or combinations under a uveitis service. The FOCUS consensus supports introducing steroid-sparing systemic therapy for persistent or severe noninfectious inflammation, threatened visual function, structural complications, corticosteroid intolerance or a need for sustained remission. Before escalation, reconsider infection, masquerade, adherence and whether the phenotype has been correctly classified. Multidisciplinary care may involve rheumatology, infectious diseases, respiratory medicine, paediatrics or obstetric medicine.
Treat complications as well as activity. Optical coherence tomography guides macular-oedema follow-up; pressure and lens are monitored during corticosteroid exposure; synechiae, cataract, glaucoma, epiretinal membrane, retinal neovascularisation and hypotony may need specific intervention. Tubercular, syphilitic, viral, toxoplasma and fungal uveitis follow distinct antimicrobial pathways. Outcomes should document inactive disease, recurrence, visual function and treatment toxicity. Never equate symptom relief with complete control, and never withdraw long-term systemic therapy abruptly without the treating team's plan.
Prescribing Information
Topical corticosteroid for anterior uveitis is a prescription that requires a confirmed examination, specified eye, product, frequency, taper and review date. Potency and ocular penetration differ between preparations. Risks include pressure elevation, cataract, delayed epithelial healing and worsening of untreated infection. Cycloplegic or mydriatic agents may reduce pain and synechiae risk but can blur near vision and are selected according to age, chamber anatomy and clinical need. Patients should not use leftover drops from a previous attack because a similar symptom can represent keratitis or angle closure.
Periocular and intravitreal corticosteroid can produce substantial local exposure and require consent for pressure rise, cataract and procedure-related infection. Systemic corticosteroid affects glucose, blood pressure, bone, mood, sleep and infection risk; baseline assessment, gastroprotection or bone measures and tapering are individualized. Noncorticosteroid immunomodulators and biologics require specialist selection, pregnancy counselling, vaccination planning, blood monitoring and screening for infections such as tuberculosis and hepatitis according to the agent and local protocol. The FOCUS statements emphasize collecting safety data, shared decisions and defined treatment goals.
Antimicrobial treatment must follow the suspected organism and ocular syndrome. A positive tuberculosis immune test alone should not trigger uncoordinated antitubercular therapy, while credible ocular tuberculosis should be managed jointly with eye and TB services. Drug interactions and ocular toxicity monitoring matter. This guide intentionally omits drug doses and branded hierarchies because laterality, anatomical site, microbial evidence, age, pregnancy, comorbidity and product availability change safe prescribing.
When to Refer
Arrange same-day ophthalmic assessment for a painful photophobic red eye with reduced vision, visible hypopyon, suspected anterior-chamber inflammation, new dense floaters, posterior-segment signs or an uncertain diagnosis. Refer immediately through an emergency pathway after eye surgery, intravitreal injection or penetrating trauma when pain, redness or visual decline could represent endophthalmitis. A corneal infiltrate, high pressure, fixed or irregular pupil, relative afferent pupillary defect, retinal whitening, vasculitis or optic-disc swelling also shortens urgency. Do not send a potentially infectious eye for routine review after starting steroid.
Established uveitis needs specialist follow-up until activity, cause, complications and treatment toxicity are controlled. Expedite uveitis-service referral for bilateral, recurrent, chronic, intermediate, posterior or panuveitis; childhood disease; pregnancy; macular oedema; retinal vasculitis; optic-nerve involvement; steroid dependence; or suspected systemic association. Rheumatology or physician referral complements rather than replaces ocular management. Atypical inflammation, poor response or apparent worsening during immunosuppression requires reconsideration of infection and masquerade.
In India, state the actual destination and capability required: slit-lamp examination and tonometry for anterior disease, plus dilation, imaging, microbiology and uveitis or retina expertise when posterior disease is possible. Provide acuity, laterality, onset, procedure history, pressure, current drops, immune status and key systemic features. Confirm transport and follow-up. A referral is incomplete if the patient cannot identify where and when to attend or which symptoms require immediate return.
Red Flags
Severe ocular pain, rapid visual loss, hypopyon, corneal ulceration, dense vitritis or deterioration after surgery or injection suggests infection until excluded. Retinal whitening with haemorrhage can represent necrotising viral retinitis; an immunocompromised patient may have little pain despite extensive posterior disease. Optic-disc swelling, macular involvement, occlusive retinal vasculitis, exudative detachment, very low pressure or uncontrolled high pressure threaten vision. An afferent pupillary defect or new field deficit is not explained by uncomplicated mild anterior inflammation.
Systemic red flags include meningism, focal neurological deficit, severe headache, mucocutaneous ulceration with vascular symptoms, respiratory compromise, pregnancy with severe hypertension, disseminated rash and constitutional symptoms in an immunosuppressed person. Syphilis and tuberculosis can imitate many ocular patterns; a narrow diagnostic label should not prevent appropriate testing. In a child, a quiet white eye does not exclude chronic anterior uveitis, and leucocoria or a mass-like finding raises a different emergency pathway.
Treatment red flags include worsening after corticosteroid, new fever or infection during immunomodulation, major glucose or blood-pressure disturbance, severe mood change, cytopenia, liver injury and inability to obtain required monitoring. Recurrent pain during a taper may represent relapse, but self-escalation is unsafe. A patient using topical steroid without a measured pressure remains at risk of silent steroid-induced glaucoma. Safety-net instructions should name the symptoms, receiving service and timescale rather than merely advising review if concerned.
Indian Clinical Context
India's differential diagnosis must give ocular tuberculosis deliberate but proportionate attention. The Collaborative Ocular Tuberculosis Study consensus addresses when antitubercular therapy may be initiated for anterior, intermediate and panuveitis or retinal vasculitis using combinations of phenotype and evidence. It does not mean that every positive tuberculin or interferon-gamma release assay proves ocular tuberculosis. Exposure tests indicate immune sensitization, chest imaging may support systemic disease, and ocular fluid tests have limited sensitivity; interpretation belongs with an ophthalmologist and a TB service.
Steroid treatment before credible exclusion of infection can worsen tuberculosis, herpetic retinitis, fungal disease or toxoplasmosis. Conversely, reflex antitubercular treatment for every unexplained uveitis can delay the correct diagnosis and expose patients to toxicity. Syphilis and HIV-associated disease remain important, and local prevalence, immune status and lesion morphology should guide testing. COTS is an international consensus with substantial Indian expertise, not a statutory nationwide prescribing order. State and institutional TB protocols, drug-susceptibility information and public-health reporting requirements take precedence.
Access to OCT, angiography, ocular fluid diagnostics, rheumatology and steroid-sparing medicines varies between Indian settings. A safe pathway may require staged referral from district care to a medical college or specialist centre, but urgent infection or sight-threatening disease should not be slowed by administrative sequencing. Treatment plans must consider travel, monitoring cost, pregnancy and tuberculosis screening without accepting avoidable visual loss. This draft makes no claim of uniform Indian availability or a single national uveitis algorithm.
NMC Competency Mapping
Uveitis maps to the 2024 NMC ophthalmology curriculum's Iris and Anterior Chamber sequence, competencies OP6.1 through OP6.4. OP6.1 covers definition, anatomical classification, clinical features and granulomatous versus non-granulomatous iridocyclitis. OP6.2 covers complications, investigations and treatment. OP6.3 distinguishes hyphema from hypopyon, and OP6.4 addresses systemic associations and simulated counselling. These educational outcomes do not authorize independent corticosteroid prescribing or management of posterior inflammation.
A learner should classify uveitis anatomically, describe onset and course, identify anterior-chamber cells and flare, recognise granulomatous and non-granulomatous patterns, distinguish hypopyon from hyphema and relate ocular inflammation to systemic disease. History should cover pain, consensual photophobia, floaters, recurrence, surgery, trauma, infection exposure and immune status. Examination teaching includes visual acuity, pupils, pressure, slit lamp and supervised dilation, with appropriate recognition of corneal infection, glaucoma and posterior disease.
Management knowledge should include cause-directed antimicrobial therapy, specialist-monitored corticosteroid, cycloplegia, steroid-sparing immunomodulation and complications such as synechiae, cataract, glaucoma and macular oedema. Assessment should test the safety rule to reconsider infection or masquerade when response is poor. Interprofessional learning with medicine, paediatrics, microbiology and pharmacology is appropriate. Procedural and prescribing competence requires supervised clinical training, workplace assessment and adherence to current local protocols; this guide alone cannot confer it.
Key Exam Pearls for NEET PG
SUN anatomical classification uses anterior chamber for anterior uveitis, vitreous for intermediate uveitis, retina or choroid for posterior uveitis and multiple compartments for panuveitis. Anterior uveitis causes pain, photophobia, circumcorneal congestion, cells and flare, keratic precipitates and a small or irregular pupil from posterior synechiae. Granulomatous patterns classically have large greasy keratic precipitates and iris nodules, but morphology is not a microbiological diagnosis. Intermediate uveitis often presents with floaters; posterior disease may be painless and still threaten the macula or optic nerve.
HLA-B27 spondyloarthritis is a classic recurrent acute anterior association. Juvenile idiopathic arthritis can cause chronic silent anterior disease. Sarcoidosis, Behcet disease and inflammatory bowel disease are important systemic links. Infectious differentials include tuberculosis, syphilis, toxoplasmosis and herpes viruses. Hypopyon occurs in severe sterile inflammation as well as infection; postoperative pain, visual loss and hypopyon demand emergency exclusion of endophthalmitis. Raised pressure can accompany herpetic anterior uveitis or steroid response, while ciliary shutdown may lower pressure.
Treatment questions must start with cause and anatomy. Topical steroid plus cycloplegia is a general principle for confirmed noninfectious anterior disease, not for an undiagnosed red eye. Posterior or chronic noninfectious disease may need local or systemic steroid and steroid-sparing therapy. Before escalating immunosuppression, revisit adherence, infection and masquerade. OCT detects macular oedema; angiography assesses leakage and vasculitis. The safest exam answer treats sudden visual decline, posterior involvement, high or very low pressure and suspected infection as urgent specialist problems.
Frequently Asked Questions
Is every painful red eye with photophobia caused by anterior uveitis?
No. Microbial keratitis, scleritis, acute angle closure, endophthalmitis and trauma can present similarly and require different urgent treatment. Diagnosis needs visual acuity, pupils, pressure, corneal examination and a slit-lamp assessment for anterior-chamber inflammation; empirical steroid before that assessment can be harmful.
Does a positive tuberculosis test prove that uveitis is tubercular?
No. A tuberculin or interferon-gamma release test shows immune sensitization, not necessarily ocular causation. Ophthalmic phenotype, systemic evidence, alternative diagnoses and specialist judgment must be integrated. In India, suspected ocular tuberculosis should be coordinated with a TB service rather than treated from one test result alone.
Why must intraocular pressure be checked during corticosteroid eye-drop treatment?
Both uveitis and corticosteroid treatment can raise intraocular pressure, while severe inflammation can sometimes lower it. Steroid-induced pressure elevation may be asymptomatic until optic-nerve damage occurs. Follow-up therefore checks inflammatory cells, pressure, lens and posterior complications instead of judging control only from pain relief.
When is steroid-sparing systemic treatment considered for noninfectious uveitis?
A uveitis specialist may consider it for persistent, recurrent or severe inflammation, threatened visual function, structural complications, steroid intolerance or inability to maintain control at an acceptable steroid exposure. Infection and masquerade must be reconsidered first, and baseline screening, pregnancy planning and laboratory monitoring depend on the chosen agent.
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