There is also an Accessory Tracking Developer Debug menu to test these third party accessory features
You can see the Logitech Muse, and PSVR2 Sense Controller IR LEDs fully lighting up here
Holy Shit!: Companies can also now build their own spatial accessories that work with Apple Vision Pro!
“Using IR LEDs and an IMU for precise, low-latency six-degrees-of-freedom tracking, along with physical inputs such as buttons, touchpads, and haptics. These devices can be tracked at up to 90 Hz, supporting high-motion use cases and tracking under low-light conditions
Manufacturers, including DFRobot and MikroE, will release off-the-shelf reference hardware and development kits later this year, which will be available for testing or direct use in your visionOS app.”