You might just think night vision but the entire EM spectrum would be rather more impressive than IR alone. Imagine tailing someone talking on a cell phone (commonly happens,) hiding around a corner but still seeing the signal. Or tracing radioactives by spotting a few stray gamma rays. Or being able to ID materials by their appearance in the UV. Or being able to always see flushing in suspects by IR. This would be incredibly handy in fires. But it would just be neat for the show to take the character's POV of cosmic ray ioniization. Or an X-ray look at the sky. The IR from the eyelids would cause a lot of angst, maybe excessively.