Chorioretinitis is an inflammation of the choroid, which is a lining of the retina deep in the eye. This inflammation can affect vision.

Anatomy of the Eye
AR00032_labeled eye
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Chorioretinitis may be caused by infection or by autoimmune diseases.

It is sometimes caused by an infection that you had when you were young, although the symptoms may not appear for 10 to 20 years.