I guess I don't have that strong need to know exactly when someone is looking at me. If I'm with other people I behave as if they can see me, because they probably can, and if appropriate I relax. I don't think I could reliably keep track of who was looking at me in an in-person meeting with more than three people anyway. Keeping track of that and changing behaviour when people look at me or look away seems like it would be exhausting.