Ceiling-mounted projectors use radio signals rather than IR (see RF shutter glasses). By supporting 120 frames per second (fps), active 3D glasses deliver the full resolution at 60 fps to both eyes.

Stereoscopic 3D glasses that are used with "active 3D" computers and TVs. The glasses use liquid crystal lenses that act as shutters, alternately opening and closing the view to the screen.

The ViewSonic V3D245 lists for $499, and includes a built-in IR emitter, DVI-D, VGA and audio cables, NVidia 3D Vision active shutter glasses with USB charging cable and a three year warranty.

NVIDIA's new 3D Vision 2 kit is actually relatively cheap at £149 for pair of active shutter glasses and an IR receiver. The glasses are bigger, more comfortable and block out more back ground ...