I am using a WorldTrackingProvider in a VisionOS application

let session = ARKitSession()
let worldInfo = WorldTrackingProvider()
...
try? await session.run([worldInfo])

so that I can query the position of the device using queryDeviceAnchor on each frame:

guard let pose = worldInfo.queryDeviceAnchor(atTimestamp: CACurrentMediaTime()) else {
    return 
}
let toDeviceTransform = pose.originFromAnchorTransform
let devicePosition = toDeviceTransform.translation

This works great, but I realize I don’t understand what point on the actual device
this represents for a stereo device. The left eye, middle eye, in-between the two eyes?
I assume the middle eye and the cameras are offset from this for stereo. Anyone know?