Just yesterday afternoon, my vision started going in and out. It doesn't go out of focus and then return, it's more like the images scramble for a few seconds, as though my brain doesn't want to accept what my eyes are seeing. It's so bad that I am nearly completely blind for the few seconds it occurs. After a short time, my vision returns to normal, but the same problem occurs about half a minute later, over and over. After a small dinner and a vitamin pill, it seemed to stop, though I don't know if the two are related or not. I thought the problem had solved itself, but it has just started happening again. This is extremely frustrating and more than a little unnerving. Any help would be greatly appreciated!