I have seen some pretty well dusted, but you have to beat the crap out of the glasses to do that, and they have to be old as dirt...My neighbor has a plasma pair that the stems at the ends where they are larger to hold the earsox on have worn completely smooth and his couplers are still good. It is amazing the things are still okay to wear, but as a good neighbor, I tightened them up, tossed him a set of lenses, and put on all new trim. He was crazy happy!!