Rivets I don't disagree with you. Migraine is a much more likely diagnosis than some of the nasties bandied about here. Trouble is, the downside if it is nastier is too great. When it comes to sudden changes in vision, I'll let an eye specialist tell me I'm just another hypochondriac. It's amazing what those geeky eye docs can treat nowadays, but they have to get at it while the pudding is still warm.