Why do blind animals have eyes

Like, bats. They're blind right? What's the point in giving them eyeballs?
Why hasn't evolution just eradicated them if they're so useless?
I don't get it!

I don't think they are completely blind, its just not their primary sense. The eyes in moles, I suppose eyes are vestigial organs, they went underground and found a niche there, before that they lived above ground, evolution works very slowly.

i'm sure nature will correct itself in a few thousand years.

ps: the chicken came before the egg. Here's how i know: The egg can only exist if something exists to create the egg - alla a chicken, but the chicken could've evolved from a single celled organism. Hence the chicken came first