If your eyes are the same, and you don't have a severe astigmatism $1 glasses work.
For the rest of us, go to http://zennioptical.com, plug in your Rx and inter-pupilary distance, and in three weeks you'll have UL glasses delivered to your door for as little as $15. My wife's "designer" glasses cost $35.
+1 on the glaucoma check.
[I have no vested interest in Zenni, but I do have about 6 pair of glasses spread between the house, car, the bike, and fishing kit.]