Google I/O is always full of surprises, and we came across yet another elusive bit of hardware on the show floor today: Google Glass "prescription edition". No, it's not actually called that (we made up the name), but what you're looking at is definitely Glass that's been neatly integrated with a pair of prescription glasses -- in fact, it looks a lot like the version of Glass that Google recently mentioned on its blog. We don't really know anything else about this device, but we've reached out to Google for comment. Is this a custom design built by combining Google Glass Explorer Edition with off-the shelf eyewear? Is this a Glass prototype that's designed specifically for people who wear prescription spectacles? Share your thoughts in the comments and don't forget to check out the gallery below.\n\nUpdate: Google's confirmed it's a prototype the company's experimented with that uses the same software as the Explorer Edition but slightly different hardware on the outside.\n%Breakout-8f3c0abd-d6c5-39b3-96ec-1079b419e449%\nBrad Molen contributed to this report.