It amazes me how much feeling can be conveyed in such a short amount of time through eye contact. At times it can feel almost like a kind of telepathy. I guess there's a good reason they say the eyes are the windows of the soul. For me, eye contact is one of those things that can get a bit weird and uncomfortable if I think about it too long in social situations. It's best if I let it flow and be natural. Sadly, I notice a lot of younger people who avoid eye contact all together. Perhaps they've never developed the skill having grown up with such massive amounts of screen time?