Here are some links: One time swap out https://support.google.com/glass/answer/3501111#whats_changed https://support.google.com/glass/answer/3501111#whats_chan

Here are some links: One time swap out https://support.google.com/glass/answer/3501111#whats_changed https://support.google.com/glass/answer/3501111#whats_change... Google to let Glass owners swap out for a prescription-compatible version, invite three friends to buy Glass too http://www.glassgum.com/2013/10/28/google-to-let-glass-owners-swap-out-for-a-prescription-compatible-version-invite-three-friends-to-buy-glass-too-the-next-web/ http://www.glassgum.com/2013/10/28/google-to-let-glass-owner... Google Glass Design Upgrade Revealed http://www.glassgum.com/2013/10/29/google-glass-design-upgrade-revealed-mashable/ http://www.glassgum.com/2013/10/29/google-glass-design-upgra... Google Glass Upgrade Arrives Just in Time for New Year’s http://www.glassgum.com/2013/12/16/google-glass-upgrade-arrives-just-in-time-for-new-years-mashable/ http://www.glassgum.com/2013/12/16/google-glass-upgrade-arri...