The Optic Nerve carries electrical impulses from the eye to the brain and enables us to see. Neuro Ophthalmology is the subspecialty that deals with disorders of the optic nerve. Common disorders include optic neuritis (inflammation and swelling of the optic nerve), Ischemic Optic neuropathies (Decreased blood supply to the optic nerve) and Traumatic optic neuropathy. Diagnosis of these disorders requires electrophysiological tests such as VEP/ERG and EOG.