Aren't there VR headsets that do actually perform eye-tracking? Also is projection on a retina is a thing? I thought there were prototypes at least that did th

Aren't there VR headsets that do actually perform eye-tracking? Also is projection on a retina is a thing? I thought there were prototypes at least that did that. I heard of such thing from people at MIT or maybe I misunderstood what they meant back then (some 5-6 years ago?) I did some very basic work with pupil dilation tracking using IR and it's gotta be RGB cameras or you'll just burn your eyes out (or it will feel that way anyways)