I went something like six months without my glasses because I still had an old thin frame. It turned out they'd landed on the base of a black standing lamp. I couldn't see them from six feet away (my rough height). It was when I bent down to plug something in that I found them. I'd probably lost them getting up to go to the bathroom after falling asleep on the couch cause they just "disappeared" one day. They were in plain sight (if I'd had them on) all along.