I think glasses should be detectible by sound. If you have very poor vision, then you can't find your glasses when they fall off... If they were to emit a noise if one presses a button on their keychain, then that would help out much. This wouldn't be neccesary for most people.. but you can see a hearing aid, why can't you hear glass-- Malakh, Aug 03 2000 glow in the dark sunglasses http://www.halfbake...20dark_20sunglassesA different approach to finding lost spectacles. [egnor, Aug 03 2000, last modified Oct 05 2004] if i can't find my glasses you can forget about finding my keys.-- raisin, Oct 02 2000 Ain't life complicated-- thumbwax, Oct 02 2000 I want an arm-mounted thing like the Predator had in the first movie. THAT I'd buy.-- StarChaser, Oct 02 2000 I wear contacts. Try finding a dropped contact without your contact in....And, it's true, finding key chains without the contacts is pretty difficult. If I have them in my pocket at the time I drop my contact that's great. (I only have one good eye) Now, if we can just miniturize the beeping circuit to fit invisibly in a contact lense. ;=)-- Blisterbob, Sep 14 2005 random, halfbakery