In multiple sclerosis, which symptom is most likely when optic neuritis is present?

• A. Blurry vision
• B. Pain when moving eyes
• C. Dysarthria
• D. Balance and coordination issues

Answer: (B)

Optic neuritis in MS is inflammation of the optic nerve that disrupts visual transmission and often causes pain that worsens with eye movement. The key idea is that moving the eye stretches the inflamed optic nerve, so the most characteristic symptom you’ll see is pain when you move the eyes. Vision may become blurry or rely on color desaturation, but the standout feature tied to optic neuritis itself is this eye-movement–induced pain. Symptoms like difficulty with speech or poor balance reflect other CNS MS lesions and aren’t specific to optic neuritis.