Google Glass is just the beginning. The search giant’s smartglasses are in the headlines, but numerous other players are also looking to cash in on what’s expected to be a boom in eyewear that puts virtual and augmented reality face-front.

Smartglasses overlay digital information onto the wearer’s view of the real world. Usage scenarios are limited only by developers’ imaginations. Google Glass has apps for search, navigation, photo capture and sharing, to name a few. Commercial possibilities include enhanced vision systems for use in manufacturing, engineering, health care and other industries. A surgeon could have all of a patient’s vital information literally in front of his eyes while operating, for example.

There’ll be no shortage of smartglass systems in as little as one to two years. Research firm Gartner says there are about a dozen companies with products in the works, many of them ready for prime time. There could be as many as 10 million smartglasses sold worldwide by 2016, if software developers can come up with appealing applications that provide wearers with useful, nonobvious information about their surroundings, according to IMS Research, which defines smartglasses as ‘wearable computers with a head-mounted display.