My medical is aetna....my vision plan is vsp. Vsp doesn't give you a card....you just fill out the optic center paperwork and they'll handle the insurance. Make sure the optic center you go to accepts your vision plan.
Or there should be a website, then you can type in what you are looking for and zip code and should bring up all participating providers in you area. All your medical cards and such should have come with a book explaining and a book of providers. If you are moving into Teamcare after contract passes, you may/may not have to use different providers anyway. I don't know if the benefits would reset or not, meaning if you could get another pair of glasses or not with the different coverage.