Israeli start-up LOOK has launched a crowd-sourced funding campaign to help it develop a practical and effective device for finding misplaced glasses. A tiny attachment to the spectacles connects wirelessly via an app to any mobile device. My wife would use the app several times a day.
http://www.timesofisrael.com/israeli-develops-device-for-lost-glasses/
https://www.indiegogo.com/projects/look-never-lose-your-glasses