Sidd,

You say its an important question you want an answer to and the majority of it is about detectability by people facing you from a distance of 5-10 inches, but then you've said you're not asking about the hairline?
You also agree that the general public don't go around looking for tell tale sign of wearing and its only other wearers who are interested.
But then you ask if anyone is worried about people coming up close from behind.

Sorry I got confused by what your question actually is!