Board Thread:Episode Discussion/@comment-25396609-20191214150938/@comment-4010415-20191216042934

I've always assumed that Penny has an infrared vision mode because I assumed that was how she knew Blake had cat ears. She saw the heat signatures from Blake's cat ears through the bow.

Infrared would, indeed, foil a Semblance that cloaks people in invisibility because such a Semblance would only work by messing with light, which likely wouldn't do anything with temperature.

Night vision, meanwhile... I'm not 100% sure how night vision mode works, but I would assume that it picks up on faint traces of light.