Visual Snow Syndrome
VSS is a neurological condition affecting an estimated 2–3% of people. Its hallmark is visual snow: dynamic, continuous tiny dots across the entire visual field — like watching the world through television static or a shaken snow globe, 24/7, with eyes open or closed.
Per the published diagnostic criteria, a diagnosis also requires at least two of these four symptom categories, all of which this simulator can render:
- Palinopsia — afterimages and trailing that linger after the object is gone.
- Enhanced entoptic phenomena — excessive floaters, swarms of darting dots (blue-field phenomenon), and spontaneous flashes of light (photopsia).
- Photophobia — sensitivity or intolerance to light.
- Nyctalopia — impaired night vision.
Many people also experience halos and starbursts around lights, double vision, and pulsating or trembling vision — plus non-visual symptoms like tinnitus, brain fog, and sensory overload that no screen can show.
What can help
There's no cure for VSS yet, but people commonly report these things make day-to-day life easier:
- Tinted lenses — many find rose-tinted FL-41 glasses take the edge off the static, glare and light sensitivity, indoors and out.
- Managing triggers — fatigue, stress, caffeine and certain lighting can make symptoms louder for some people; noticing your own patterns helps.
- Screen comfort — dark mode, lower brightness, warmer color temperature and larger text can make reading less exhausting.
- A clinician who knows VSS — a neurologist or neuro-ophthalmologist familiar with the condition matters; the Visual Snow Initiative maintains a directory of physicians who understand it.
None of this is medical advice — what helps varies person to person, so talk it through with your doctor.
This simulator is an approximation for empathy and education — everyone's VSS is different, and it is not a diagnostic or medical tool. It uses flicker and occasional light flashes, so take care if you're sensitive to flashing light. Learn more at the Visual Snow Initiative.
Demo photos by Soham Banerjee, H&CO, and Brett Jordan on Unsplash.