Google previously announced the technological spectacles would work with prescription lenses, but this is the first time the hardware has made an appearance.
Google confirmed to Engadget that it's only a prototype at the moment. It uses the same software as the Explorer edition of Glass that Google has been doling out to intrepid 'opinion formers' and the like, but with slightly different hardware. According to CNET's Scott Stein, however, you can't detach the Glass hardware from the frames, and they can't be folded up, so you won't be slipping them into your shirt pocket anytime soon.
Still, it's early days yet. Here's hoping Google can tweak the design and make a proper pair of next-generation specs.
In other Glass news, US politicians are seeking reassurance from Google that its device won't impinge on personal privacy, the BBC reports. Eight members of the Congressional caucus have signed and sent a letter to Google asking what data Glass will collect about those wearing it, and anyone who strays into its line of sight.
"We are curious whether this new technology could infringe on the privacy of the average American," the letter reads.
It points to Google's chequered history when it comes to privacy, such as that little incident when its Street View cars inadvertently collected data from unprotected Wi-Fi networks. One of the group's chief concerns is how Google will respect the wishes of those who are minding their own business and don't want to be identified. The group has given Google until 14 June to respond.