Why does 3D give you headaches?

Why 3D doesn't work and never will. Case closed." Ebert reprints a letter sent to him by a Hollywood film editor.

While it's far from the smoking gun that Ebert posits, it's a very good look at the "trick" that is 3D cinema. Walter Murch has worked on several high-profile films including Apocalypse Now and The English Patient , and even a 3D film from the '80s called Captain Eo .

Murch says that until holograms are commonplace — and this is far beyond simpleglasses-less technology— 3D technology can never improve. He says that while our brains can be tricked into resolving a 3D image it goes against everything we've seen in millions of years of evolution.

It's a bit technical to explain fully here, but essentially he says that in the real world the spot our eyes focus and converge on is always at the same point, but in the theatre the focus point is always the same (the screen) while the convergence point moves to follow the action. Believe us, Murch explains it much better.

But in short, your eyes and brain are doing a lot more work at just simply "looking" and this can lead to headaches, nausea and all the fun stuff.

Source: http://www.cnet.com.au