Optic Nerve Disorders

Optic nerve disorders are a group of conditions affecting the optic nerve — the critical pathway that transmits visual signals from the eye to the brain — and are among the leading causes of vision loss and blindness worldwide. The category includes glaucoma, optic neuritis, ischemic optic neuropathy, and hereditary optic neuropathies such as Leber's hereditary optic neuropathy. Glaucoma is by far the most common optic nerve disorder, affecting approximately 4.22 million U.S. adults, with nearly half unaware of their condition. Optic neuritis — inflammation of the optic nerve most commonly associated with multiple sclerosis — is another significant condition: a 2025 study drawing on electronic health records from over 113 million patients found a U.S. prevalence of 51.6 per 100,000 people in 2023, with females at significantly higher risk than males, and Black individuals showing the highest prevalence among racial groups. Prevalence of optic neuritis increased steadily from 2016 to 2023, with notable rises among younger populations and the Hispanic community. Ischemic optic neuropathy — caused by reduced blood flow to the optic nerve — is the most common cause of sudden optic nerve-related vision loss in adults over 50. Across all types, early detection through comprehensive eye exams is critical, as optic nerve damage is often irreversible.