Smartglasses are eyewear that show information to the viewer.
Some smartglasses may just be an mp3 player built into glasses, such as the Groov3 Shades.[1]
The Google Glass is a series of smartglasses that has a display.
Other smartglasses include Focals by North.
Smartglasses may or may not have positional tracking, either 3DOF or 6DOF.