Technology Editor, David Gilbert, gives his initial impressions on the Google Glass.

"Google Glass is basically an Android smartphone transformed into a pair of glasses with the screen projected directly into your eyeline. But this is an accessory for your handset, not a replacement.

The whole thing is really lightweight, lighter than a typical pair of sunglasses, thanks to its titanium and plastic construction . As standard it has no lenses in place, but the Explorer Edition (which was sent out to thousands of enthusiasts and developers at a cost of $1,500 a pair) comes with a pair of clear lenses and tinted lenses which snap into place easily.

Whether or not you use the lenses is up to you. Wearing Glass without them makes you look like one of the Borg from Star Trek, but the consumer edition - which could arrive as early as this year - will almost certainly be much slicker and less obviously Google Glass.

The device allows you to carry out a set of basic actions like getting directions, seeing your messages and emails and taking pictures and video with the device's 5 megapixel camera. All this is displayed on a screen which is projected through a glass prism which sits in front and slightly above your right eye with sounds coming through a bone conduction speaker which sits next to your ear.

You can adjust the prism slightly by moving it in or out but to get the screen to sit just right you will have to adjust where Glass sits on your nose.

Once you have it situated right, the screen sits there, just above your natural eyeline. Initially you will find yourself starring upwards at it all the time, but after a while you will grow used to it being there and simply ignore it.

The resolution of the screen as you can image is not great and in bright sunlight it all but disappears. However it does adjust somewhat to compensate in bright light, but a lot of the time it's simply not enough."