Google has made a post on the Project Glass Google+ page to confirm that future versions of Google Glass will come with support for prescription lenses. Google says that Glass will be modular, which will allow frames and lenses to be interchangeable. This will allow prescription lenses to be fitted to Glass.
The Glass design is modular, so you will be able to add frames and lenses that match your prescription. We understand how important this is and we've been working hard on it. We're still perfecting the design for prescription frames. Although the frames won't be ready for the Explorer Edition's release, hang in there -- you can expect to see them later this year.
This is good news for prescription eyeglass wearers around the world. While they may have to wait a bit longer to get a pair of Glass, they will eventually not be left out of the fun. Google expects to launch a pair of Glass that supports prescription lenses before the holiday season.