What if an evil character will have glowing eyes which are used like two flashlights?

I pity the evil assassin who's trying to sneek up on people in the dark. They'd have to keep their eyes closed so as to not be spotted.

Creeping forward... creeping forward... I hope there's no rakes there. What's this? Oh, it's a fence. Over the fence... creeping forward... What's this? Oh, it's human! "Excuse me, are you Kirnmath? I've got a contract here for your head."