The “snow” you see may be colorful, black-and-white or transparent. It may flash. Scientists aren’t sure why visual snow syndrome happens. It may be related to excitability in the occipital lobes …

Visual snow can appear at any time, but it commonly appears at birth, late teenage years, and early adulthood.

There are ongoing trials to study and further confirm the cortical origin and thalamo-cortical dysrhythmia as a cause of visual snow using magnetoencephalography (MEG).

Research suggests it is related to changes in the visual processing centers of the brain, as well as alterations in the neural signals between the eyes and the brain. The origin of VSS has also …

Nov 13, 2024 · Learn all you need to know about visual snow syndrome, including the symptoms, causes, and treatments.

Jul 7, 2022 · While there is no known cause for visual snow syndrome, it most likely results from a malfunction in the brain. VSS researchers consider it a neurological condition with both …

Visual snow is often considered a symptom of persistent migraine aura without infarction. However, it can also be caused by other conditions, such as medication side effects, …

Dec 7, 2025 · Individuals with VSS often experience photophobia, which is a significant sensitivity or intolerance to light that can cause pain or discomfort. Nyctalopia, or impaired night vision, is …

Dec 30, 2025 · Scientists believe VSS is caused by hyperexcitability of the visual cortex — the part of your brain that turns electrical signals into images. Visual snow triggers anxiety. Anxiety …

Oct 9, 2025 · Visual snow syndrome is a rare condition that is linked to, but different from, migraines. Learn about the symptoms, causes, diagnosis, and treatments.