I've been noticing how lifeless Biden's eyes have looked for a while.
One can look at most people and see at least a hint of compassion, empathy, emotion, etc. in another person's eyes. But for Biden, it is almost like looking at two lumps of coal. One cannot tell what he might be thinking or feeling or how he is going act/react. Then again, he probably doesn't know how how he is going think or react to stimuli either. Many around me feel that he is a plant, both figuratively (having the cognitive capacity of a potted plant) and literally, being a placeholder/puppet for the Democrats/Socialists/Anarchists.
IMHO, his eyes give him the look of a person that would just as well screw you over than to help you. Then again, look at his record while being in Public Office and one wouldn't be far off on that assumption.