"Try Change" glasses - glasses with interchangeable frames and arms
TRY CHANGE (made by Allison)offers a nice system of having a few basic shaped lenses and then a wide variety of snap on bridges and arms (called wishbones).
I just got a pair from my optical store which came with 3 sets of wishbones and am now having fun accessing more wishbones styles and colours from the internet.
System works well -easy to snap on and off. I am loving the colour options. I paid 350.00 (bifocal and transition) for the initial glasses with 3 colour choices. other wishbones seem to cost about 50.00 if you shop the internnet. My Canadian optician wants 80.00 for each extra pair,