Which visual tests are commonly used in the assessment of multiple sclerosis?

• A. Visual evoked potentials and optical coherence tomography
• B. Color vision testing and visual acuity only
• C. Fundus photography alone
• D. Fluorescein angiography

Answer: (A)

In multiple sclerosis, evaluating the optic pathway helps detect and monitor neurological involvement affecting vision. Visual evoked potentials measure how quickly the brain responds to a visual stimulus, reflecting conduction along the optic nerve. Demyelination slows this conduction, so the P100 wave is often delayed; this can reveal optic nerve involvement even when vision seems normal, making VEP a sensitive functional test for MS-related optic neuritis.

Optical coherence tomography provides a detailed image of the retina, allowing precise measurement of the retinal nerve fiber layer and ganglion cell layer thickness. In MS, axonal loss from optic neuritis or broader neurodegenerative processes leads to thinning on OCT, which correlates with disability and helps track disease progression over time.

Other tests like color vision testing or visual acuity are less sensitive for MS-specific changes, and imaging of the retina with fundus photography or fluorescein angiography targets retinal structure or vasculature rather than CNS demyelination, so they’re not as useful for assessing MS.