I am surprised this wasn't done much sooner, especially for "flagship" smartphones. When I was in university ~15 years ago, I met a grad student [0] who impleme

I am surprised this wasn't done much sooner, especially for "flagship" smartphones. When I was in university ~15 years ago, I met a grad student [0] who implemented impressive eye tracking software and even played WoW with it as a demo. 0: He is a professor now, with many publications in eye tracking, https://scholar.google.com/citations?user=i96gkYMAAAAJ&origin=serp_auto https://scholar.google.com/citations?user=i96gkYMAAAAJ&origi...