Iritis may be a consequence of trauma or nontraumatic causes:

Blunt trauma to the eye can cause traumatic inflammation of the iris.

Nontraumatic iritis is frequently associated with ankylosing spondylitis, Reiter syndrome, sarcoidosis, inflammatory bowel disease, and psoriasis.

Infectious causes may include Lyme disease, tuberculosis, toxoplasmosis, syphilis, and herpes simplex and herpes zoster viruses.

In a large number of cases, no cause for iritis is found.

Generally affects only one eye.

Signs and symptoms may include any or all of the following:

Pain in the eye or brow region

Worsened eye pain when exposed to bright light

Reddened eye, especially adjacent to the iris

Small or funny shaped pupil

Blurred vision


Associated with inflammation of the iris and spasm of the ciliary body responsible for miosis and painful pupillary constriction.

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