Pro tip dont go to the chain stores for your glasses.
The place I went to last year sold me these god dammed progressive lenses,they sucked big time.
As it turned out I didn't need progesive lenses or bifocals either they just sold me shit I didn't need and they got the perscription wrong,so for the last year I have not been able to properly see the world.
I found a local opthamologist who has been around for years.This old dude tuned me in big time. its like I'm seeing the world through wide screen HD glasses.
On the one hand I'm pissed off at the people who fucked me over and on the other hand I'm very happy now that I can see properly.
It may cost a bit more for a local small store but beleive me it is well worth it.