Iriditis is a type of anterior uveitis in which inflammation of the iris often affects the ciliary body, so clinically isolated iritis or ciliary inflammation is rare and often develops simultaneously. The etiology is commonly seen in the following conditions: 1. Herpes virus infection: herpes simplex virus/varicella zoster virus, which may be accompanied by corneal scarring and an occasional history of cutaneous blistering. 2, localized noninfectious inflammation: e.g., lens-mediated inflammation, such as incomplete cataract extraction or overripe cataract; Fuchs syndrome: milder symptoms are seen with diffuse iris stromal atrophy and tiny posterior corneal deposits (inflammatory cells or pigment deposited on the posterior corneal surface) that cover the entire corneal endothelium. 3, systemic non-infectious inflammatory diseases: for example, juvenile idiopathic arthritis, mostly bilateral onset, may be accompanied by secondary glaucoma, concurrent cataracts, corneal banding degeneration; leukoarthrosis: acute anterior chamber pus accumulation, may be accompanied by oral ulcers, genital ulcers. 4, systemic infectious inflammation: tuberculosis, leprosy, rheumatism, and constructive telangiectasia are also important causes of iridocyclitis. 5, adjacent iris: other ocular tissues of the ciliary body, such as keratitis and scleritis, can also lead to this disease. Therefore, local and systemic infectious or non-infectious causes of the eye can cause iritis.