https://www.varifocals.net/google-glass/
Only image I can find on the website that seems to demonstrate anything is maybe this one
https://cdn.shopify.com/s/files/1/0555/1810/1695/files/Nose_...
So does it project image on the glass? Maybe projects image directly on retina? How does it work? What is the resolution etc? Why not answer these more technical questions in some article further on the website?