Try passthrough on Oculus Quest 2 to get an idea of how easy this is to solve. It just uses the motion sensor cameras and it's pixelated and black and white, but you get some overlays and you can get a very good idea of how quickly this will be solved in full 8k hidef with overlays that look like they belong.

A simple solution would be to have liquid crystals on the glasses, like electronic auto-darkening sunglasses or welding helmets. Of course, this could only change the light level of the entire field of view at once (since it's way too close to your eye to focus), but that's still useful for many things.

I’ve always wondered this too. Once they figure how to make me feel like I’m sunbathing late night on the beach instead of by my pool, I’m sold.