I'm sorry, but glasses style augmented reality is already possible. 50 years is even too long of a time span for when AR glasses are attractive enough to the general public enough to reach >1B users.
A line of text floating in your view is doable.
Seeing 3D renderings in a dark environment with 30 minutes of battery is doable.
The original vision of augmenting human vision without a bunch of caveats and limitations is not doable today.
Spectacles by Snap is a cool accomplishment, but mostly the form factor is useful for recording video form a human's perspective and not augmenting one's vision.
You can do world locked 3D renderings in an lit inside room and have more a few hours of battery life. Yes here are limitations, but all technology has limitations. As time passes we will make them better and better. There is a bar we will have to pass before they become attractive to regular people and I'm not claiming we are there yet.
