I have been putting together my own google glass as a side project at home for a while now. At the time, I didn't look much into AR displays, but I did order a VuFine: https://www.vufine.com/ - a head mounted 720p screen. This is coupled to a raspberry pi + pijuice UPS

This, coupled with a raspi night vision camera attached to my head, fakes "AR" since I can see in the vufine what the camera sees (though AR was not really the goal for this version, but eventually). I am using SDL to render items on top of the video feed (for instance, using opencv to find and put boxes around faces).

Additionally, I want to get a range sensor and place that looking behind me, and render something in the display to give me an idea of what items are behind me, and how close. I am thinking about rendering a circle from metal gear solid 4 [0] to give me an impression of where things are behind me, and how close they are (greater amplitude to indicate how close something is)

I definitely want to get an AR setup, as I feel like that would be best. I will check out what options are link in this thread.

[0] https://media.moddb.com/images/games/1/52/51310/ps3_mgs4_118...