I always get blurry vision when I'm anxious. Especially in public places like stores. I don't think blurry vision causes panic - but I do know that panic causes blurry vision. If you get panicky after noticing your blurry vision, it is because of your thought patterns when you notice the blurry vision. You expect a panic attack and so one comes on. What you tell yourself in whatever the situation is, will determine how you react in regards to anxiety and panic. When you notice your eyes getting blurry, instead of saying, oh no my eyes are blurry, I'm going to panic.... say to yourself, I know my eyes get blurry when I'm feeling anxious so that is why my eyes are blurry now and I know I will get through it and be ok because I have so many times before and this time is no different. I know it sounds strange, but it does work.
You probably need to get some glasses. As far the dialated pupils go, I would have a doctor look at it. If for nothing else but to put your mind at ease. I have read that eyes dialate when the 'fight of flight' instinct kicks in though. Panic is the 'fight or flight' response.