Wearing sunglasses makes us look difficult-to-recognize to humans, because we tend to focus on the eyes, and recognize people by their eyes more than other part

Wearing sunglasses makes us look difficult-to-recognize to humans, because we tend to focus on the eyes, and recognize people by their eyes more than other parts of their face (relatively speaking). However, these algorithms have no such biases. It's more difficult because there's less information to work with, sure, but they can identify you just as easily by the shape of your nose, mouth, and the distance between reference points on the lower half of your face, as the top half of your face. You might as well be covering your mouth and chin and nothing else, for all it matters.