Notable appearances: Comics, Batman: The Animated Series, Batman: Arkham Asylum, Batman: Arkham City
Have you noticed that whenever you open up a Batman comic or watch a Batman cartoon that his eyes are always completely white? That’s not an artistic decision; this look serves a purpose. At all times, Batman actually wears high-tech lenses that provide a multitude of functions. He can switch these lenses between night vision, thermal vision, x-ray vision, and a host of other optical settings that help him with solving crimes.
These different settings come in handy whenever Batman needs additional help finding his target. But aside from one brief scene in The Dark Knight, these lenses have been mainly absent from the movie series for some reason. Despite not getting any love in live-action, there is no doubt that these lenses have been a staple of the look of the Bat for decades.