I wanted to like these . . . but they fell out of the case, even after I had sandwiched a folded piece of paper into the case to 'snug it up', so now I have no glasses.  The setup would be better served, I think, if the glasses went into the TOP of the case, not the side, as this makes them prone to falling out, as mine did.  I barely used them, and did notice that they scratched very easily (as polycarbonate can).  I am contemplating buying just the glasses AGAIN, but the vendor wants $20 just for them alone, so I will have to think about it.  It is a great idea, and it's my bad for losing them out of the case.  I just want to warn others;  great idea, great glasses, just watch out for that case losing your specs.