ridiculous.
These people have no idea what they're talking about. The 3D effect does not untrain depth perception and, additionally, the assumption that children are better equipped to view the world is nonsense. Brain plasticity is remarkably elastic long into late age, and, combined with the understanding that children are the ones who would be the most sensitive to a degeneration due to a "lack of input", I can safely say that this article is ill-conceived and baseless.
Also, for the brain to actually miss out on a crucial stage for developing depth perception, the child would need to be deprived of all input, not just for a few, or even 8 hours a day.
I just also wanted to throw out there that parallax motion is the only actual visual cue we use to detect depth. Everything else requires brain interpretation. Shadows, Size discrepancy, continuity, etc etc. Parallax motion and steropsis are the only cues that use retinal disparity to tell distance, rather than rely on brain interpretation. Some cues are a mix, but really, if you are watching a 3D movie, the only variable being manipulated is the object's spatial disparity. All the other cues still exist. There are still shadows, there are still size variations etc etc. You are not "ignoring" the other cues, nor being trained to ignore them.
In fact, their idea does not even work in the reverse. Television does not have depth in it's picture. If anything, television is depriving it's viewers of input from which to develop stereopsis. Which isn't true, because the fundamental idea behind this entire argument is invalid.
