I recently found some great glasses that have interchangable lenses. They are "Moab" and I think they are made by Smith. Excellent for inexpensive contact-lense wearers like myself. I got them on-line and on sale. There is a clear, light orange, and a regular dark lense. I think I paid maybe $40.

I know of a great resource but feel a bit sheepish plugging it here. E me off the list and I will send the link.

Carole