I have also had this since my first tbi two years ago. It's called "visual snow." I haven't investigated much about it as it is a mostly benign symptom, but I just think of it as the visual version of tinnitus. I had read on— I believe a VA hospital article concerning visual field loss post tbi— that visual problems are of the most widely reported symptoms for TBI patients. I'm not sure of the neurological significance for this, if there is one.

Anyway I assume that, like with tinnitus, there is probably little attention paid to visual snow and probably more paid to more severe conditions like visual field or acuity loss. For me anyway, tinnitus was way harder to learn to live with and I wish there were something for these kinds of ailments. As for visual snow, I have yet to visit a neuro-opthalmologist so I don't know if there's any treatment for it. I doubt it anyway. The bright side is that when you close your eyes to go to sleep, it goes away. Or rather, it's considered normal to see fuzzy light when one's eyes are closed.