Sergey Brin, CEO and co-founder of Google, wears a Google Glass during a product demonstration during Google I/O 2012 at Moscone Center in San Francisco, California June 27, 2012. REUTERS/Stephen Lam (UNITED STATES - Tags: BUSINESS SCIENCE TECHNOLOGY) - RTR348TI

Google has progressed so far with the development of its glasses for displaying additional digital content that the group wants to test prototypes publicly. A few dozen employees and selected testers will wear the glasses in some locations in the United States from August, Google announced on Tuesday.

The devices should display route instructions or translations in the real environment for the wearer. Such glasses are also expected from Apple and Facebook. Google is aiming for a market launch in 2024, the tech website The Verge reported back in January.

The glasses have cameras and microphones with which they record their surroundings – for example, they can show a user the translated version of a menu directly over the original or transcribe a conversation. The visual Internet search for objects in the field of vision should also be tried out.