As I said, this has persisted across three units. Or at least, the issue with wink and on-head detection has. This most recent issue hasn't, but it's a brand new Glass unit (arrived earlier today, replacing a foil-bubbled one).
The image in the prism is centered both vertically and horizontally. Do you wear prescription frames for Glass or are you wearing a separate pair of glasses with Glass on top of them, as I am? Because prescription Glass frames should absolutely work, yes. My situation is different, and I don't expect it to work - I'd just like some tips from either the Glass team, or people who've had this problem and then fixed it, for trying to come up with my own solution.