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"Google has been promising to make its Google Glass wearable technology compatible with prescription glasses, and that day has now come after the company released four 'frames,' priced ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/google/2014/01/28/google-glass-can-now-be-used-with-regular-glasses-after-google-introduces-225-frames/?_escaped_fragment_=u7BAv>