FBL, that started to happen to me in my mid forties. I would be seeing fine, then one eye would get blurry and I couldn't read. Then it would correct itself. Turns out it was the start of cataracts for me. I ended up having surgery at 54 and that problem has gone away. I can't remember if you were glasses or not, but sometimes a prescription change can help. You need to remain King of Retro Video Games!