In John Carpenter's 1988 film They Live, Hoffman lenses are depicted as special sunglasses that allow the wearer to see hidden messages and the true nature of their environment. When the protagonist, Nada, puts on these glasses, he can perceive the concealed presence of aliens and view subliminal messages such as "OBEY" and "CONSUME," which are otherwise invisible to the naked eye. The lenses serve as a symbolic tool for revealing the film's critique of consumerism and social control.
Xia already gave you the quoted explanation for why you're wrong, but everyone should watch the movie They Live, at least once. It's a riot of a movie.
Fun fact: the Southpark episode "cripple fight" with that long ass fight between Timmy and Jimmy, their fight scene is a near blow for blow reenactment of a fight scene in They Live, between Rowdy Roddy Piper and Keith David.