"Are the active shutter glasses comfortable to wear?"

In order to create the illusion of depth, 3D systems need to send separate images to your left and right eyes. Panasonic's 3D TV system uses the 'sequential frame' method to bring its 3D images to life.

This means the screen shows images designed for your left and right eyes alternately.

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To make sure that each eye only the correct image, the system uses special 'active shutter' glasses that are synchronised with the images on screen. These glasses use a liquid crystal mechanism to block out light to each eye in turn.

As they switch from left to right eye and back, they briefly blank out both eyes, to make sure there's no 'crosstalk' between the two images that might spoil the 3D effect.

The switch from left to right eyes happens 120 times a second when you're watching a 3D Blu-ray disc – 60 images for your left eye, and 60 for the right. That's faster than the 50 frames a second you'll be used to watching on an ordinary TV broadcasts.

So, just as you don't see any annoying flicker from your TV screen, you won't be troubled by any flickering from your active shutter glasses - making them comfortable to wear for long periods.

Panasonic's active shutter glasses have been ergonomically created to sit comfortably on your face, and are specially designed to allow those who use prescription spectacles to wear their existing glasses underneath.