› Prevalence and incidence
› Uveitis prevalence approximately 38 to 714 per 100,000 population
› Anterior uveitis accounts for 41% to 60% of all uveitis cases
› Annual incidence approximately 17 to 52 per 100,000
› Leading cause of preventable blindness in working-age adults
› Accounts for 10% to 15% of total blindness in developed countries
› Demographics
› Peak incidence age 20 to 50 years (60% to 80% of cases)
› HLA-B27-associated uveitis male predominance (ratio up to 1.5:1)
› JIA-associated uveitis predominantly female (3:1)
› Etiology distribution
› Idiopathic — 27% to 51% of cases
› HLA-B27-associated — 15% to 50% of anterior uveitis cases
› Infectious — HSV/VZV (5%-15%), TB (1%-13%), syphilis (1%-4%), toxoplasma (5%-7%)
› Masquerade syndromes — 1% to 5%
› Geographic variation
› Behcet disease more common along Silk Road (Turkey, Middle East, Central Asia)
› TB-associated uveitis more prevalent in low and middle-income countries
› Environmental risk factors include air pollution and tobacco smoking
› Inflammatory cascade
› Breakdown of blood-aqueous barrier
› Tight junction disruption in ciliary body and iris vasculature
› Protein and cellular exudation into aqueous humor (flare and cells)
› T-cell mediated inflammation
› CD4+ Th1 and Th17 cells predominate in HLA-B27-associated uveitis
› TNF-alpha, IL-6, and IL-17 drive inflammation
› Molecular mimicry hypothesis
› HLA-B27 may present bacterial antigens cross-reactive with ocular self-antigens
› HLA-B27 mechanism
› HLA-B27 is a class I major histocompatibility complex molecule
› Aberrant folding can trigger UPR (unfolded protein response) and NLRP3 inflammasome activation
› Dysregulation of innate and adaptive immunity in intestine and joint
› Complications of untreated inflammation
› Posterior synechiae
› Iris-lens adhesions from fibrinous exudate
› Can cause pupillary block and secondary glaucoma
› Cataract formation
› Chronic inflammation and steroid exposure
› Macular edema
› Most common cause of visual loss
› Cystoid macular edema detectable on OCT
› Secondary glaucoma
› Trabecular meshwork obstruction by inflammatory cells
Therapeutic Considerations
› Corticosteroid therapy rationale
› Anti-inflammatory mechanism
› Stabilizes blood-aqueous barrier
› Suppresses cytokine release and cellular infiltration
› Topical route preferred for anterior uveitis
› High intraocular bioavailability with prednisolone acetate 1%
› Suspension requires shaking for uniform dosing
› Risks of chronic steroid use
› Steroid-induced glaucoma (IOP rise in 30% to 40% of patients)
› Posterior subcapsular cataract with prolonged use
› Cycloplegic rationale
› Ciliary body paralysis
› Eliminates painful ciliary muscle spasm
› Stabilizes blood-aqueous barrier by reducing uveal blood flow
› Synechiae prevention
› Dilated pupil prevents iris-lens contact and adhesion
› Steroid-sparing rationale for chronic disease
› Chronic uveitis requires long-term immunosuppression
› Topical steroids inadequate for posterior or intermediate disease
› Systemic agents target upstream inflammatory pathways
› Anti-TNF therapy (adalimumab) — Class I recommendation for non-infectious uveitis
› Reduces uveitis flares and steroid burden in chronic disease
› Key treatment principle
› Infectious etiologies must be excluded or treated before initiating immunosuppression
› Steroids without antiviral coverage worsens herpetic uveitis
› TB must be treated before anti-TNF therapy to prevent reactivation
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