When did you start having vision problems? Have they been consistent? I ask because I'm on Plaquenil, and while rare, it can cause problems with your eyes and you are supposed to get checked by an opthamologist (not an optomitrist) every 6 - 8 months. You might want to find out if you need to do that as well.
Also, every Spring, my vision goes bad due to allergies for about 4-5 months...it doesn't seem like allergies b/c I don't have them too bad, but it's been a consistent problem for a few years now that I don't freak too much about it. My vision is very blurred and it's hard to focus. Not much helps it and they don't see much of anything when I get examined - but it's a pretty severe change to me.
Good luck. ***