You need to see an eye doctor and have him or her check you before and after eating.
Does this occur is if you just chew without eating anything? The is a condition call crocodile tears where there is some misdirected nerve and when you chew you tear.
No I'm not wearing glasses, But my vision does seem more like foggy glasses. And it doesn't seem to matter what I eat. I moved to Pa a few years ago and have issues with my sinuses just about daily. My doctor says to just take over the counter medication. The problem is I take this medication several times a week. Could the pressure from my sinuses cause this issue?
Are glasses fogging up? Is this when you eat hot soup?
Otherwise, I do not know. Please see an ophthalmologist.