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:
Read more: http://www.evisualsnow.com/tag/visual-snow-cure/#ixzz251G8g8fI - 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?