Uveitis

Uveitis is an inflammation of the middle layer of the eye. It is usually characterized by a red or pink tinge to the sclera or white part of the eye surrounding the iris. 
Different types of uveitis are characterized by the location of the inflammation:
*Anterior - affecting the iris and or the anterior chamber;
*Intermediate - affecting the vitreous cavity;
*Posterior - affecting the retina and/or choroid.
Uveitis is a medical emergency as the condition can result in blindness (and is in fact by far the most common cause of blindness). However, about 90% of cases affect only the anterior cells and are either self-resolving or can be resolved with simple treatment. 
Uveitis is associated with a number of systemic diseases including Behcet's disease, Chronic granulomatous disease, Kawasaki's disease, Multiple sclerosis, Polyarteritis nodosa, Sarcoidosis, Lupus and Lyme disease. It is also associated with several infections. There are also some diseases that are non-systemic that cause it. In addition, some non-inflammatory diseases can present with uveitis as