While I was cleaning my glasses one of the lenses popped out. A screw just came loose, I got it back in the frame easily enough (well, I had to do it while wearing an older pair of glasses with a weaker prescription that was making my left eye ache while trying to see the screw, but still), but before that I decided to photograph the lens.

Now I am making you look at this coke bottle bottom my optometrist put in frames.