Brucellosis is a zoonotic disease with a wide range of ophthalmic manifestations, including optic neuritis. It is most commonly caused by the consumption of raw or unpasteurised dairy products. We report a case of a 43-year male patient with an altitudinal visual field defect and unilateral optic neuritis caused by Brucella. While his visual acuity improved within 6 months of receiving anti-Brucella therapy and corticosteroid therapy, the altitudinal visual field defect persisted. Brucellosis can affect the central nervous system and eyes, in addition to having systemic manifestations. The ocular involvement of Brucella remains poorly understood. Early diagnosis and appropriate treatment can prevent serious complications in endemic areas. Key Words: Optic neuritis, Neurobrucellosis, Ocular brucellosis.