Uveitis refers to the uveal inflammation or swelling. Uveal is the eye's middle layer, which contains the iris, ciliary body and choroid. Uveal's primary function is to provides blood supply, especially to the retina.

Uveitis can affect one or both eyes. Its symptoms may develop quickly, and they often include: blurred vision, floating visual spots, light sensitivity, eye redness or eye pain. Uveitis has two forms: anterior uveitis and posterior uveitis.

The following factors may cause uveitis: eye infection, eye injury, rheumatoid arthritis, ankylosing spondylitis, various autoimmune disorders. But in many cases, the uveitis cause is unknown.

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