There are competition between many devices , specially DARPA which wants to create cheap, mass-produced mind-reading device and Google which announced that Glass '2' upgrade will work with prescription glasses.
Do think which one is realistic applicable?
http://www.dvice.com/2013-10-11/darpa-wants-create-cheap-mass-produced-mind-reading-device
http://www.dvice.com/2013-10-29/google-glass-2-upgrade-will-work-prescription-glasses