Which condition is most commonly associated with development of optic neuritis?

• A. SLE
• B. Sarcoidosis
• C. Multiple Sclerosis
• D. Retinoblastoma

Answer: (C)

Optic neuritis is an inflammatory demyelinating attack of the optic nerve, and it is most strongly linked to multiple sclerosis. In MS, the immune system attacks CNS myelin, and the optic nerve is a common site of involvement. Patients typically present with subacute, monocular vision loss that worsens with eye movement, reduced color vision, and a relative afferent pupillary defect. This association is reinforced by findings on MRI showing demyelinating plaques in the brain and by CSF tests that can show oligoclonal bands in MS. While other conditions like SLE or sarcoidosis can affect the optic nerve, their connection to optic neuritis is less consistent, and retinoblastoma is a retinal tumor rather than a demyelinating optic nerve process. Thus, multiple sclerosis is the most commonly associated condition with the development of optic neuritis.