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