TechAlter did a nice breakdown of the optics and display tech in the visionpro.
the pancake lenses seem like they arent worth the trouble. having to go to micro led to get the necessary nits to compensate for the loss in luminance from the pancake just to be a bit thinner at the cost of eating up battery and generating more heat which will shorten the life of the display elements. this seems like a juicero level of excessive spending.
the 4.5x increase in resolution needed for 60ppd @120deg seems a decade away from being affordable.
but goddamn the meta holographic lens tech is sexy.
I coincidentally stumbled on that yesterday.
Highly recommend it.
I'm a display nerd and researched all that info to better understand VR displays over many hours, spread over many weeks.
So I didn't learn anything new except for the Holographic lens stuff, but everything else is bang on and it's all in one place, and he explains it better than most other sources. IMO this is the go to resource for understanding VR optics.
He clearly did tons of research to nail down all the details like that, when so many other lazy YT "creators" just use their assumptions and opinions.
On Pancake lenses, I was also disappointed when I first discovered how much light was blocked by them. When I first heard the term, I thought they were like Pancake camera lenses which are just small, simple lenses, but in the VR context they are folded optics, partially mirrored, and polarized lenses, that can block up to 90% of the light.