Glasses generally allow people to see out of and into the eyes of the wearer. The subjects of this trope, however, have glasses that are reminiscent of the mirror windows of crime-show examination rooms - they can see you, but you can't see them. This is not a threatening gesture like Scary Shiny Glasses. It may be permanent, but it isn't silly Nerd Glasses.
Perhaps the artist was lazy, but [...] [tvtropes.org]