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UK surgeons have become the first in the world to use Google Glass in the operating theatre.

Orthopaedic expert David Isaac of the Torbay Hospital in Devon donned the voice-activated glasses for a recent procedure in a global first.

The unique features of Google's wearable tech enable any number of possibilities in the medical field including students actually being able to watch procedures from a surgeon's eye view.

But Google Glass isn't just for the medical profession - there are thousands of uses for the state-of-the-art wearable tech.

Here's our comprehensive guide with everything you need to know.

What is it?

Google Glass is effectively a wearable computer with an optical head-mounted display.

The heads-up display coupled with voice activation allows users to see and interact with information in a smartphone-like hands-free format.

The original explorer version retailed at around $1,500 USD with the consumer edition coming in lower at the same price as your average smartphone.

What is it like to wear?

The high-tech specs video everything you see and could revolutionise everyday life.

From recording video or taking a picture with a simple "OK Glass, take a picture" to social networking and even getting directions, the sky is the limit.

Google released this helpful video last year to give a window into just what it's like to wear Glass. Check it out below.

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What can you do with it?

As we've already said Glass has an almost limitless spectrum of possibilities.

Even in its infancy Google's baby has been shown in a number of intriguing and exciting scenarios.

The proposal

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Is there a more romantic thing than the good old fashioned marriage proposal?

Well these loved-up fans of Google Glass let the world into one of the most intimate moments couples can have.

Popping the question has been captured through the eyes of those asking and answering in this 90 second clip called 'Marry Me (through Google Glass)'.

Sex

(Image: www.glassandsex.com)

The Sex with Glass app allows people to watch themselves having sex through their partner's eyes.

They can then replay it to each other by connecting their phones to the app - before the footage is deleted after five hours.

Controlled via voice commands, the user can request the lights be turned off or start the recording by saying "Okay Glass, it’s time". To stop the recording, they say "OK glass, pull out.”

Football refereeing

Bundesliga chiefs are considering using Glass to allow referees to see video replays like television viewers - and prevent future ghost goals.

The refereeing howler that saw Stefan Kiessling's infamous ghost goal allowed to stand has sparked debate over the use of video technology.

Bundesliga referees chief Andreas Rettig believes something needs to be done and is an advocate for the introduction of new technology to help officials.

"We are always open to new technological innovations," he said in an interview with German newspaper Sued Deutsche. "But it is also clear that we need to address the fundamental decisions more carefully."