LG's passive 3D clip-on lenses attach easily to your eyeglasses. Like clip-on sunglasses, these clip-ons attach to the center of your eyeglasses via a spring-clip. These passive lenses work their 3D magic via polarization they work the same way as the 3D glasses you get a a movie theater. They aren't "shutter" glasses, so there's no flicker, which some viewers find distracting. And these clip-ons require no batteries.
The AG-F220 clip-ons work with 2011 and newer LG Cinema 3D LED-LCD TVs. Warranty: 30 days.