MEMS gyroscopes are sub-mm volume now. Whether the accuracy is sufficient or not, I don't know enough to comment. I would guess that probably it is. http://www

MEMS gyroscopes are sub-mm volume now. Whether the accuracy is sufficient or not, I don't know enough to comment. I would guess that probably it is. http://www.mcubemems.com/product/mc7010-9-axis-igyro/ http://www.mcubemems.com/product/mc7010-9-axis-igyro/ (that's 3mm square). Plenty of space on a pair of glasses for a 9 dof IMU. 11 milliseconds on a modern CPU is a long time for image processing. You need a lot of grunt to do it, but it would work. It makes sense that the glasses should just be a dumb screen with some odometry, connected to a much more powerful data source.