I learned in high school to look people in the eye more, though I also grew up with a mother who demanded, during her angry outbursts, that I look at her while she was talking to me. So, I've been at this a while. I tend to look in the person's left eye, which is directly across from my right eye. For some reason, looking across to their right eye is very difficult for me. I've heard that there's some sort of meaning conveyed by which eye you look in, but I can't remember what it is. I'd find looking in both kind of weird.
When I found out that sometimes Aspies accidentally stare at people in overcompensation, I was concerned, but I've checked in with my friends lately and been told my eye contact is fine. Good thing. Having initially experimented with it, I've found that trying to count seconds and looking back and forth is very tiring on my eyes, as well as very distracting. It makes it very hard to focus on what the other person is saying.
I have to admit that, while looking in someone's eye or eyes may be more comfortable for them and may convey some extra info to me, watching the mouth does make it easier sometimes to understand their words. Think about it. If it takes you a while to process the auditory input, a little visual is a nice aid. So, maybe we're lip reading a little to help ourselves catch up, right? Also, if it cuts down on other information coming in, we don't have to "multitask" by processing different, and only sometimes congruent, messages.
I'd say, don't worry about this thing too much. If you learn to make eye contact enough to do it when you want to for some reason, just in case such a situation might one day arise, you'll probably more easily and naturally make just enough for it to be all right when the time comes. There is an up side, you know. When someone who's really earned your trust smiles, you get to see all of it. As I've gone on in life, I've come to see that more of a really genuine smile is in the eyes than I'd originally realized. And, if you're not sure you trust someone, if you see that, even though their smile is broad, it doesn't quite reach their eyes, this may help to protect you. (This means finding out, however, if they might have some legitimate reason for that to be the case, whether it's for neurological, emotional, or muscular reasons.)
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