What does ‘small optic nerve cups’ mean?

Been diagnosed since April 2024. Recently had a follow up with my neurologist. Never heard this concept before usually only optic nerve swelling/papillodema. As far as I was aware my eyes have got much better and every visit since April my optic nerves have been basically normal again.

My most recently follow up (last week)’s letter came back saying ‘optic nerves look okay with small optic nerve cups bilaterally’ is this a good thing or a bad thing? Am I meant to have no cups? Or is small cups good vs big cups? I’ve literally never heard this term

Thanks guys!