Eye contact really varies for me.
I don't seem to have a lot of natural inclination toward it, and do have some aversion, especially because it keeps me from understanding what someone is saying.
On the occasion I remember falling in love with someone, though, for some reason staring into her eyes was not threatening or unpleasant at all. Although we didn't talk, just stared.
Also sometimes it's less threatening in certain situations. I used to know an autistic man who communicated mainly through eye contact and gesture (no speech) and he wasn't threatening. Nor is, usually, my current support staff (in fact I stare at her face a lot to study her facial expressions).
I can make eye contact for a prolonged time if I am very angry.
I have sometimes stared at my eyes in the mirror and that doesn't bother me as much.
I had a psychologist use a very old form of behavior mod on me to make eye contact: This was the technique where you bang someone on the leg until they look at you and stop banging as hard or as much when they are looking at your eyes. This means that I am sometimes afraid not to make eye contact.
But apparently I don't make a lot of it overall. And it certainly takes away from comprehension rather than adding to it, most of the time (especially since concentric circles can make me blank out for awhile).
I notice that light eyes are normally worse than dark eyes.
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"In my world it's a place of patterns and feel. In my world it's a haven for what is real. It's my world, nobody can steal it, but people like me, we live in the shadows." -Donna Williams