Or maybe it's just a comic book

Superman Man of Steel disguise: Prosopagnosia explains why no one recognizes Clark Kent. - Slate Magazine:

"With his power of super-neuropsychology, Superman has cleverly secluded himself within a rare epidemiological cluster of prosopagnosics. At the Daily Planet, where close observation is part of a reporter’s or photographer’s job description, the hero’s disguise gives nothing away. Nobody recognizes the Man of Steel’s face because they simply can’t perceive it. "