The glasses must be switched on by pressing a small gray button. Thus, the lens darkens almost imperceptibly. The 3D effect is clear. Somehow seems to need some time to adapt the human visual system through the 3D irritation after an approximately two-hour movie. Maybe it's the fact that this way of seeing is still unfamiliar.
It's fun to see with these 3D glasses. It is light and fits perfectly over the existing glasses. It is better to sit together with the spectacles because the image orientation of the TV set on.