Eye-tracking uses simple IR reflection sensors to follow the black dot of the pupil. It has no dependence on skin or iris color. It's been done for decades in p

Eye-tracking uses simple IR reflection sensors to follow the black dot of the pupil. It has no dependence on skin or iris color. It's been done for decades in psychological studies and doesn't require complex ML algorithms to do. Eye tracking is not a particularly hard thing to implement in hardware, it's just an added expense for dubious--very dubious--utility. Probably the "best" use of eye tracking for modern VR systems is pretty much just reflecting the eye motion in avatars during VR teleconferencing sessions to give a more natural "face-to-face conversation" feel. Beyond that, things like eye-tracking as input and foveated rendering turn out to only be great on paper.