I sometimes have a difficult time trying to tell if I actually have tinnitus, or if I can simply detect something that's there for everyone. Plenty of websites say that you will always be able to hear the blood flowing through your ears, and that doesn't count as tinnitus. It's just that most people subconsciously filter that out, to the point where it can't be detected even if they look for it, except while in a completely silent, noise-deadening room, such as an anechoic chamber.
It's similar to how I don't have any issues with color in my vision, yet when I look at a completely solid and flat color, I can see noise in it. It's not visual snow, because it obstructs nothing and I can easily tell the difference between even very similar colors, but I don't seem to experience the "noise reduction effect" where if I stare at a solid color, it is completely and entirely solid and unchanging and has no noise at all.
I believe I'm simply observing entropy, and that noise is supposed to be there, because it's impossible for light to always explore all possible paths instantaneously and exhaustively. But I'm not supposed to be able to notice or perceive it, I don't think.
I think it has to do with me being autistic, but it's hard to find any descriptions of similar experiences online, and it's also hard to communicate about it with others.
Exception: my right eye has significantly more noise, to the point where it's difficult to actually see and read through that eye, even though I can still see all colors and text perfectly sharply. If I close my left eye, I will see the darkness through my right, to the point where it's distracting. I think this was an error caused by me being cross-eyed at birth; my right eye just sorta deteriorated, and now it only exists for depth perception.