Fair point re: sunglasses! Not sure "mirrored" would stop light being projected back through but may well help disguise it. Maybe a simple black LCD layer to block the outgoing light might help.

Also, I don't want the creepy Xray app.

But porn has this way of working into society/technology so I don't doubt for a second some form of that app will exist if it doesn't already.

I definitely would want smart glasses that don't obviously look like smart glasses!