This weekend my distance vision got much worse. I saw the optometrist who said this is not a normal vision change due to the severity and suddenness of the change. He suspected diabetes, but so far my blood sugars are normal. My lenses and retinas look fine. Does anybody have any ideas about what might be causing this? I go for an MRI May 8th. So far my doctor is baffled since I don't have any other neuological deficits. Thanks.