Yup, I think it is not directly related to my question, but thanks! And upon further testing, we figured out that the hand tracking actually does capture data from with facedown cameras.

Hi, sorry, but I don't seem to find anything related to vision code?

Hi, very similar to QR code, but I know that it doesn't read QR code (confirmed in developer labs). And I know it reads Vision Code. One example is if you order it with zeiss lens, it comes with a vision code, like in below: https://www.zeiss.com/vision-care/us/myzeiss-vision.html And this article explains a bit more about the vision code and where it is originated from: https://ar-code.com/blog/apple-vision-pro-codes-the-future-of-ar-and-qr-codes-on-visionos