[edzo4]

I'd glue it to the bottom of the coffee cup (The outside), and I'd use a chain for the eyeglasses, of course if the eyeglasses were on a chain you could leave them around your neck and be less likely to misplace them in the first place :^)

[TruthWillWin]

Tried that, didn’t work well, collected too many cookie crumbs.

[Bigg Red]

The answer is Clic reading glasses. I never misplace mine.