About 11-12 years ago somebody started selling tiny mirrors mounted on a angled plastic substrate with adhesive under it for attaching to glasses. Main target were (bi)cyclists, secondary corrections guards.
They seemed like they'd work pretty well -- I bought a pair (as a cyclist I was always concerned about vehicles behind me) -- but quit riding very soon after. I've thought about a pair on my regular glasses (now that I have same) but it would be a bit too obvious with the "frames" I use.
Superglue is a bad idea too. You have to get it perfect the first time. A less aggressive adhesive, one that lets you try and adjust a few times, is better.
NOT!!
Do NOT be deceived!