Visual snow or visual static is a relatively unknown, transitory or persisting visual symptom where people see snow or television-like static in their visual field.
This visual snow can appear in parts or take up the whole of their visual field. The severity of visual snow varies from person to person but it can inhibit a person’s daily life, making it difficult to read, see in detail and focus correctly.
In most cases, visual snow becomes much more noticeable in low light conditions as well as against dark backgrounds.
Visual Snow Symptoms
Along with visual snow, sufferers also often have other physical symptoms.
These may include -
- Negative/positive afterimages and trailing (palinopsia)
- Light sensitivity
- Blue field entoptic phenomenon
- Benign fasciculation syndrome
- Haidinger’s brush
- Purkinje’s tree
- Eustachian tube problems
- Red eye
Sufferers often note that lack of sleep, high stress, dehydration and poor nourishment exacerbate their symptoms.
You can find an extensive guide of symptoms on our visual snow symptoms page.
Visual Snow Causes
Because of its relatively unknown status, no official cause has yet to be identified. Sufferers commonly blame symptoms on a type of migraine know as persistent aura without infarction, commonly referred to as persistent migraine aura (PMA).
Some sufferers of visual snow note that they have had visual snow since childhood. It wasn’t until their symptoms got worse, when they researched their symptoms online, did they find it had a name and that it wasn’t normal. Others seem to first develop visual snow symptoms in their mid to late teens.
Visual Snow Treatment
I describe what I did to naturally relieve my visual snow here.