Ocular toxoplasmosis is caused by the protozoan Toxoplasma gondii. It commonly presents as focal necrotizing retinochoroiditis and can cause vision loss. While most infections are asymptomatic, it can be life-threatening for newborns and immunocompromised patients. People become infected through contact with cat feces or consuming undercooked meat containing cysts. Recurrent lesions are common due to the parasite's ability to form dormant tissue cysts. Treatment aims to reduce inflammation and inhibit parasite replication, but cannot eliminate the infection entirely.