Don't be hard on yourself. A glance is enough. I know that some aspies hold the glance for too long.
FYI eye contact is not just seeing if the person is paying attention. It can convey a smile etc etc
For a while in the ex dino cafe I would practice body language and roport back. My husband woul shake hands, and we'd count out stepping up to each other. clasping hands, eye contact, and disengaging.
Today I will count out how many seconds I make with eye contact when saying hello and report back.
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NEVER EVER GIVE UP
I think there must be some chronic learning disability that is so prevalent among NT's that it goes unnoticed by the "experts". Krex