Now where did I put my glasses?

Professor Thomas Villanova, in the great absent-minded tradition, was forever misplacing things. However, unlike his hapless colleagues, he decided to do something about it and created a deceptively simple pair of glasses (incorporating a highly sophisticated neural interface) that let him see what he’d misplaced and where he had left it.
     The trouble only started when he managed to misplace the glasses themselves and then find them right away, because as he learned soon enough, they had done their job, and he could no longer leave his empty room without being crushed by the realization of all he had lost.