One trick: If you can get the prescription (they're supposed to
   give it to you by law when you ask - and you might have to
   remind them) - is go to zennioptical.com and play around with
   different glasses. I hav...e a high prescription so mine are
   $25-30 but regular prescriptions are $10-$20. You put your
   numbers in - measuring between your pupils is the hardest part -
   order them and wait three weeks and they come in from China. If
   you screw it up - oh well, it wasn't much money. I got to play
   around with purple glasses, pitch black sunglasses (bad idea
   btw) - and all different kinds of frames and tints through the
   years."