An abnormal condition characterized by an acute autoimmune reaction of the eye. It is caused by hypersensitivity of the eye to the protein of the crystalline lens and commonly follows trauma to the crystalline lens or cataract surgery. Associated symptoms include swelling and inflammation of the eye, severe pain, and blurred vision. The substance of the lens is invaded by polymorphonuclear cells and mononuclear phagocytes. Accurate diagnosis must differentiate between this condition and infectious endophthalmitis. Therapy is supportive and commonly includes the administration of corticosteroids and atropine. Refractory cases may require surgical removal of the lens.