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There are plenty of products on the market that managed to integrate a HUD into a pair of glasses, not least of which being Google Glass.

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Google Glass required quite considerable optical system with prisms and etc:

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?

Google Glass was pretty akward, and was not shown on the lens. You had to look up and to the side to see the display.

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