The uveal tissue comprises of iris, ciliary body and choroid. The inflammation of uveal tissue is called as uveitis. A workshop held in Baltimore, Maryland, USA in 2004 under the aegis of International Uveitis Study Group, devised a set of uniform criteria for the classification and grading of uveitis. This meeting was called Standardization of Uveitis Nomenclature. It is a genome located on the short arm of chromosome. It is present in around 8% of the western population and 1% of the Asian population. But almost 50% to 60% of the patients with acute anterior uveitis are HLA-B27 positive. HLA-B27 positivity is generally associated with anterior non-granulomatous uveitis. Uveitis which results from immune reaction to lens material is called lens-associated uveitis. Intermediate uveitis refers to inflammation localized to the vitreous and peripheral retina. The term intermediate uveitis includes pars planitis, posterior cyclitis and hyalites. Juvenile rheumatoid arthritis is also known as juvenile idiopathic arthritis. Juvenile idiopathic arthritis, as defined by the American Rheumatism Association, is the presence of arthritis (chronic, seronegative and peripheral) before the age of 16 years, of at least 3 months duration, when other causes have been excluded. Toxoplasmosis is caused by an obligate, intracellular protozoan Toxoplasma gondi. It is the most common ocular finding in patients with AIDS occurring in almost 50 to 70% of the patients. Candida albicans is a dimorphic fungus. Ocular candidiasis has increased recently due to widespread use of immunosuppressive therapy, hyperalimentation and intravenous drugs. It is the most common cause of ocular fungal uveitis. Tuberculosis is caused by Mycobacterium tuberculosis, which is an Acid-fast bacilli. As there is lack of uniformity in the diagnosis of tubercular uveitis, the exact prevalence is not known. The prevalence of ocular tuberculosis was reported to be 1.39% from one center.