The idea of being able to watch movies and TV in three dimensions is nothing new - Jaws 3D anyone? In fact, the idea of using special glasses to get a pseudo-3D effect from looking at side-by-side frames is still going strong in both cinemas and through Sky TV's new Sky3D channel. But now technology has kicked on, and the marketeers are desperate for us to buy into the next generation too.

This newer form of 3D technology is known as "Active 3D", and also uses special glasses, albeit in a different way to deliver full-HD images in glorious 3D. Sadly there's one minor drawback: a significant minority of people suffer from adverse reactions to using the glasses, forcing the TV companies to rather embarrassingly issue health warnings. The future may indeed be 3D, but it's not quite ready for primetime just yet.

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