This seems to have a lot of trouble when wearing glasses (large-style glasses). I was surprised of how bad it seemed for 2019 tech, then tooky glasses away and was blown away of how good it is.
It seemed to have a little trouble with light reflecting off my glasses (sometimes it found my eyes but placed my pupils more or less on my eyebrows) but it generally did OK with my glasses.
My glasses are closer to the "invsible frames" side of the spectrum than the Harry Caray / Elvis Costello style, so maybe that matters.
I guess maybe I should just review the code but I was trying to figure out if it uses other facial features to "anchor" the eyes or just the (fairly recognizable) features of human eyes themselves. Your glasses experience makes me guess it is pretty eye dependent -- it does have more trouble with one eye covered for example, whereas if it was anchoring off some combination of ear/nose/mouth/chin it should be easy enough to ID the eye from half the face, let alone with just an eyepatch-sized cover.
