Google announced on Google+ that they are finally offering prescription frames and a set of new sunshades for Google Glass.
Google Glass launched the "Titanium Collection" with four feather-light titanium frames. They are working with vision insurance (such as VSP) to help you get your prescription fitted for it.
Supposedly, Google Glass Explorers will be able to access and potentially buy the new frames and shades this afternoon.
Here is a video:
Since I don't wear glasses, I am not sure if I would buy these.
Forum discussion at Google+.