Shouldn't I wait for a 3D system without glasses?

No. While it's true that there are 3D TV systems in development that work without glasses, only a few small monitor screens between 15 and 20 inches across are available now. Full-size televisions won't be around for at least five to 10 years.

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And even when they do arrive, there are a number of things you need to know.

In order to work without glasses, these 'autostereoscopic' 3D TV systems need to aim the left and right halves of the 3D images very precisely at your left and right eyes. To do this, the screen of the TV is composed of alternating arrays of tiny 'lenses' that angle light either left or right, towards each eye.

The downside of this system is that it only works properly when you're sitting directly in front of the TV. This is OK if you're using your screen close up to play a 3D video game - but it's not not much use if want to gather round the TV to watch a movie with family or friends.

The other, even bigger, downside of glass-less systems is that, because they don't use a conventional TV screen, they can only display 3D content – so if you want to watch ordinary 2D TV programmes, you'll need to buy another TV.

An active-shutter 3D system like the one used by Panasonic's VT20 offers you the best of both worlds in 2D and 3D.