Work on digital glasses that overlay information on top of the user's view of the world has been carried out by Microsoft.
A patent applied for by the US tech firm describes how the eyewear could be used to bring up statistics over a wearer's view of a baseball game or details of characters in a play.
The newly-released document was filed in May 2011 and is highly detailed.
If a product comes to market it could challenge Google's Project Glass.
Google is planning to deliver its augmented reality glasses to developers early next year and then follow with a release to consumers in 2014.
Smaller firms - such as Vuzix, TTP and Explore Engage - are also working on rival systems
http://www.bbc.co.uk/news/technology-20462840
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