AR is colloquially understood to mean overlaying your field of vision with graphics that interact with reality in your field of vision. By way of a real-world

AR is colloquially understood to mean overlaying your field of vision with graphics that interact with reality in your field of vision. By way of a real-world example, military pilots have heads-up displays that overlay IDs of aircraft on the aircraft as they appear to the pilot. That's AR. My volvo has a heads-up display that show me my speed, the current speed limit, warnings, lane guidance... But none of that points to anything in my field of vision. Not AR. Mercedes also have heads-up displays, and while I don't own one, I saw a demonstration where when you are using adaptive cruise control, it highlights the car it is following. That's AR. The above is my lay understanding. If you buy this distinction between "heads up display" as a general term, and "AR" as a specific use of a heads up display, then Glass was not AR. It was just a heads-up display.