Optic neuritis is best described as:

• A. An inflammatory condition of the retina
• B. A vascular occlusion of the retinal arteries
• C. A clinical syndrome that is usually bilateral
• D. An infectious disease affecting the choroid

Answer: (C)

Optic neuritis is an inflammatory process of the optic nerve that presents as a subacute change in vision, often with pain on eye movement. It’s about the nerve itself, not the retina, retinal arteries, or choroid. Describing it as a clinical syndrome emphasizes the recognizable pattern of signs—optic nerve inflammation leading to vision loss and typically an afferent pupillary defect—often seen in the setting of demyelinating diseases like multiple sclerosis. In many cases, involvement is bilateral or becomes bilateral over time, which is why it’s framed as a clinical syndrome that is usually bilateral. The other options don’t fit because they describe diseases of other ocular structures: the retina, the retinal arteries, or the choroid, rather than the optic nerve.