I am curious because I started getting them a few years ago and when I got my first one I thought I was going blind. I was reading a magazine and suddenly my central vision was gone and had to stop reading. None of the doctors I went to knew what was wrong. One jerkoff doctor even said I was hallucinating. It wasn't until I looked on the computer that I found out what was happening. I was getting the visual disturbances of migraines but without the pain. I get them only once every few years now. Takes up to a half an hour for my vision to go back to normal.