Is there actually a market for this ? Like do people say to themselves"this book would be better if it was strapped to my eyes"?
I don't think it's a product for me, but I think there's at least a small market for it.
Absolutely. I read before going to sleep every night. Back in the day, I'd often wake up in the middle of the night with the bedside lamp still on. Now I use a Kindle that turns itself off after a while (I have an iPad too, but iPads hurt when you go to sleep and they bonk you in the face), but it's still not entirely comfortable to use for that purpose.
If the glasses were comfortable enough to not disturb sleep, and durable enough that you didn't have to worry about shattering the eInk display if you rolled over on them, I would definitely be interested.
To that end, maybe a goggles setup with separate lenses, with comfy elastic bands rather than a rigid glasses frame. That might require some ingenuity... I notice the frames are pretty thick, suggesting there's some electronics (or more likely, batteries) inside.