Our gadgets around us is changing and i think that it will continue for a while. I really wonder about if there is a nice example about usability and overall experience testing methods for Personal area network gadgets, especially head positioned visual ones,glasses.

For instance, eye-tracking was a method for usability testing before but now eye movements are changing pages or even an action for the device itself. Ergonomics are another perspective that we can rely on but could not find any study about the comfortable eye movements while there are many studies about tracking cursor and movements.