Eyes/Non-crusty Abraded cornea?

I noticed that Cupcake's cornea looks like it has some missing. Instead of being nice and round, there is a part in the middle of the cornea that looks like a few layers are gone. There is no redness or weepiness, they eye is shiny. Everything else is normal and of course, she is acting fine. It is too late to go to the vet and the emergency vets don't know cavies. Do I take her to the vet tomorrow? What could this be? (I couldn't get a good picture).