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Thank you. My vision has suddenly become strange. My peripheral vision is one huge, and lovely moving prism.....worse in the left eye. I can't focus on the prism...it moves and jumps if I try. Walking about is a little difficult..as is typing! I feel very well...I have no visual problems and never get headaches. I was going out but can't drive, I know. What is it and if I lie down for a while will it go? It's been like this for about half an hour. Gx