Earlier quoted context omitted.
Is this really likely to be downstream of the Vision Pro implementation? I would think that eye-tracking with specialized hardware at a fixed position very close to the eye is very different to doing it at a distance with a general purpose front facing camera.
Typically eye-trackers work by illuminating the eyes with near infrared light and using infrared cameras. This creates a higher contrast image of the pupils, etc. I assume Apple is doing this in the Vision Pro. Eye-tracking can also be done with just visible light, though. Apple has the benefit of knowing where all the user interface elements are on screen, so eye-tracking in this on the iPhone or iPad doesn't need t…
Precision is the issue because we are mostly moving our eyes in about 8 directions, there’s no precision because we don’t know how to measure focusing of our eye lens with a camera yet (unless that too is just a matter of getting a picture).
Squinting would be the closest thing to physically expressing focusing. So the camera needs to know I’m looking left with my eye, followed by a squint to achieve precision. Seems stressful though.
Gonna need AI just to do noise cancelling of involuntary things your eyes do like pupil dilation, blinking.