Times ago i found glasses with LCD shutters as lenses, and a cable with a 3,5mm jack (probably some experiment for 3D or "secret reading" with PC and audio output, but it's just a guess)
I think i still have them around, but at the moment i don't have any idea about where i've put them ..... anyway, i had found them in an electronic fair .....
Don't know if there's something similar selled around, actually ..... maybe these units used for 3D cinema, but they are wireless and a lot expensives, afaik .....