Visual snow syndrome
MONDO:0018486Visual snow syndrome is described as a persistent visual problem characterized by seeing snow-like dots. Migraines are a common symptom. Many people also see drifting blobs of varying size and shape (floaters), visual effects (entopic phenomenon), glare, halos, starbursts, trails, odd colors and shapes, and may have persistent recurrence of a visual image (palinopsia) and double vision. Additional symptoms may include fatigue, tinnitus, or depersonalization and depression. Most people have normal vision tests and normal brain images. Standard migraine treatments are often not helpful. There is no cure or effective treatment to completely relieve the symptoms, but medication seems to help some people with visual snow.
Also known as: visual snow
2 clinical trials for this condition and its sub-types, 2 tagged with Visual snow syndrome itself.
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Scientists scan brains to uncover the mystery of visual snow
Knowledge-focused Recruiting nowThis study aims to understand what causes Visual Snow Syndrome (VSS), a condition where people see constant flickering dots across their vision. Researchers will use brain scans and visual tests to find which brain pathways are involved. About 100 adults with VSS, migraine, or he…
Sponsor: University of Minnesota • Aim: Knowledge-focused
Last updated Jun 27, 2026 08:11 UTC
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Scientists use super MRI to peek inside brains of migraine and epilepsy patients
Knowledge-focused Recruiting nowThis study uses a powerful 7T MRI scanner to look at brain structure and activity in people with migraine, visual snow, or epilepsy, as well as healthy volunteers. The goal is to better understand how these conditions affect the brain. No treatment or medication is tested—only ob…
Sponsor: University of Zurich • Aim: Knowledge-focused
Last updated Jun 27, 2026 07:54 UTC