Quest 3 has the passthrough API now that lets apps access the camera feeds as well. I’m eagerly awaiting Meta or a third-party to implement something similar.
There’s also other specialist devices for the vision impaired like myself, but as far as I know none of them give you magnified STEREO vision (although maybe the new eSight does, I’m not sure tbh).
There’s also bioptic glasses, but they’re chunky. Honestly give me glasses with micro-OLED displays like the viewfinder on the Sony DSLR cameras attached to a top-tier phone camera sensor and lens construction; my phone zooms in amazingly far yet is thinner than any bioptic or monocular I’ve ever seen.
I’ve looked into building this kind of thing a few times but I think it might be above the components I can get my hands on.