The glasses are advanced Kryptonian technology that prevent people from realizing that Clark Kent has another identity as a space alien. (Really!)
by KenJ:
Seems kind of counterproductive if it's going to cause everyone to pass out or have vertigo. All that's going to do is draw attention to the wearer.
Ken, it only does that to people who knew Clark Kent back as a youngster in Smallville and knew that there was something "odd" about him then. People like Lex Luthor, for example. (That is, the Lex of the "Smallville" TV show, the one who was so very interested in the teenaged Clark Kent.)
If you never met Clark Kent before, all the glasses do is keep you from recognizing that really, he looks a whole lot like Superman.
