In manga and anime, sometimes a character's "eyes become money," me ga okane ni naru 目がお金になる. This happens when they've set their eyes on money, thinking about money, trying to get a huge sum of money, dreaming of becoming rich, and so on.
Sometimes this symbol is animated as eyes spinning vertically like a slot machine and stopping on a money symbol as if they hit a jackpot.
Anime: Keijo!!!!!!!! 競女！！！！！！！！ (Episode 3)