Vision Health

The "Swinging Flashlight Test:" What Your Eye Doctor is Looking For


What is a Marcus Gunn Pupil?

What is supposed to happen?

What does the "swinging light test" indicate?

What other conditions are associated with the Marcus Gunn Pupil?

Does Marcus Gunn Sign mean I have MS?

What other tests should be conducted to see if I have MS?

Lisa Emrich

Lisa Emrich


Living with multiple sclerosis and rheumatoid Arthritis, Lisa Emrich is an award-winning, passionate patient advocate, health writer, classical musician, and backroad cyclist. Her stories inspire others to live better and stay active. Lisa is author of the blog Brass and Ivory: Life with MS and RA and founder of the Carnival of MS Bloggers. Lisa frequently works with organizations in support of better policies, patient-centered research, and research funding.

Lisa serves on HealthCentral’s Health Advocates Advisory Board, and is a Social Ambassador for the MSHealthCentral Facebook page.