Samsung PN51E6500EFXZA - Manual (Page 640)

possible from the 3D Active Glasses.
The 3D images don’t look quite right.
The ideal viewing distance is three
times or more the height of the screen.
We also recommend sitting with your
eyes level with the screen.
The batteries in the 3D glasses don’t last
Turn off 3D glasses while not using
them. If you leave 3D glasses on,
battery lifespan is shortened.