Visual Snow- Persistent aura without infarction

Visual snow and Persistent aura without infraction are a constant phenomena of your brain playing perceptual tricks on you. Essentially our brains are playing with our perceptions every hour of every day. Some people it does not effect they as much but for others it can cause some severe problems and even anxiety.

 Persistent Migraine Without Infraction is a migraine aura that persists beyond the migraine itself. Generally the longer prolonged auras are visual but sporadically other aspects of the phenomena can be other aura phenomena. Here is a list of the common ones associated with Visual Snow:

  • Visual snow – Seeing snow or television-like static in parts of or the whole of your visual field. Visual snow can be any color but it usually consists of small, translucent dots whose flicker intensity varies from person to person.
  • Palinopsia – A visual disturbance that causes images to persist to some extent even after their corresponding stimulus has left.
  • Tinnitus – Characterized by a noise or ringing in the ears.
  • Floaters – Spots or specks that wander indiscriminately around in your visual field.
  • Light sensitivity - Also known as photosensitivity, light sensitivity is identified by an increased sensitivity to light. This includes artificial light as well as natural sunlight.
  • Phosphenes – A phenomenon characterized by seeing light without light actually entering the eye.
  • Blue field entoptic phenomenon – Commonly known as Scheerer’s phenomenon, it is the appearance of tiny bright dots which move quickly along squiggly lines in the visual field, when looking into bright blue light (most often the sky).
  • Halos/rays – Also commonly referred to as starbursting, consists of seeing halos or rays around sources of light. This also includes reflected sunlight off a car, for instance.
  • Benign fasciculation syndrome – Characterized by twitching of various voluntary muscles in the body.
  • Haidinger’s brush – An entoptic phenomenon in which people are able to perceive polarization of light.
  • Purkinje’s tree – A visual phenomenon characterized by seeing the retinal blood vessels in one’s own eye.
  • Eustachian tube problems – In addition to tinnitus, sufferers of visual snow often experience ear fullness as well as a clicking sound when swallowing.
  • Red eye - Characterized by abnormal redness of the eye or eyes.

  • Read more: - pretty cool site for this sort of thing I have found so far.

    Personally I've had a persistent migraine aura for a very long time and it has been of the Visual Snow variety. 

    Palinopsia- I assume this is afterimages, I do get this a lot and I assume everyone is familiar with this affect. I just get them quite a bit.
    Tinnitus-I had no idea people with VS often had this as well, but yeah I do have constant tinnitus. Silence has a sound and it is not pleasant.
    Floaters- are common with visual snow and these are those round dots you see in your visual field that move with your eyes. I think they are a reflection of something in your eye if I recall correctly. Most people see them from time to time, they are just more common with VS.
    Light Sensitivity- Well, migraines and fibromyalgia ensure light is not my freaking friend.
    Phosphenes- not sure about this one, unless it is the phenomena when we close our eyes we see lights... warping fields of color where there should be none.
    Blue field-Now I also have very intense Blue field entopic phenomenon and I actually thought they were the same thing, but this is actually sort of cool if you can see it. They are just pinprick sparkles of light dancing in the sky... billions of them, in a chaotic pattern really. And they are vivid against a blue background, thus the name, but you can see them against a white background (like a wall) or a computer screen or even anything bright you can see them flicker and dancing, sort of distorting things during the bright daylight hours. A little more about Blue field phenomena
    Halos/rays- This one is a sporadic one for me. Just randomly occurs.
    Eustachian tube problems- yeah, but not sure if this is a VS this or not, but yeah.

    So visual snow... what is that about then? People commonly say like a TV without reception... the black and white static. That is true. It is a grainy, staticy movement imposed on everything you see all the time, but worse at night. It makes things indistinct, surreal and distorted. I often think of it like a Claude Monet painting... sort of indistinct but with movement, shifting. At night I would say it is... not a good idea to drive because the distortion makes things too indistinct. During the day I can see the the static when I look at a wall or anything, it makes things grainy, or pixil-ized, but it is more clear. Of course during the day there are other issues; severe light sensitivity, the blue field phenomena, warping effects, other migraine issues with vision (objects appear to be moving, warping, vertigo, pulsing effect). Add it all up and even during the day things are surreal.

    Here is a Claude Monet painting. You can see what I mean... his style is indistinct and if you can imagine this is how you saw but every dot of color moved and shifted... then you would be seeing this like me! Cool eh?
    And here is an awesome video that will show sort of what we see...
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