There are many different ways to deliver different views to the left and right eyes, and they differ in effectiveness as well as functional complexity.
Call of Duty: Black Ops II 3D Gaming Glasses feature polarized lenses - one lens is polarized horizontally and the other is polarized vertically. This allows unwanted views to be cancelled out, letting the left eye see just what the left eye is supposed to and the right eye see just what the right eye is supposed to, creating the 3D effect.
I am familiar with this method of creating a 3D display, from movie theaters utilizing two projectors each having a polarized lens. However, I was completely baffled when I saw this method being used with an LG 3D television at the Call of Duty: Black Ops II review event. It worked beautifully, but how the television screen had interleaved images shown polarized along two different axes are beyond me.
But, yes, as I said, they did the job admirably. The 3D effect was great and was especially fun to use for the Zombies gameplay.
I also used the Call of Duty: Black Ops II 3D Gaming Glasses at my local Rave Motion Pictures theater to watch Wreck-It Ralph in 3D. The film used RealD technology, which is a polarization-based system, and the Call of Duty: Black Ops II 3D Gaming Glasses worked wonderfully. If you'd like to stroll into your local theater in style, now you can bring your own stylish Black Ops II glasses when you go to see the latest 3D flick. (Like a bouse.)