I have put together a few links on the subject of smart glasses. I hope everyone has quick access to the topic. As I understand it, it should already be possible today to look at pictures, maybe even videos. If this is already done, then the way to read the ebook is probably quite short, at least not as far in the distant future, as we all still believe.
english wiki:
https://en.wikipedia.org/wiki/Smartglasses
german wiki:
https://de.wikipedia.org/wiki/Smartglasses
interview with Thad Starner on youtube:
https://www.youtube.com/watch?v=68mBrgEs9RM
hope that can help and push it.