While normal jellyfish don't have any eyes, box jellyfish have 24 eyes.
Looking into my question on the internet, in one answer on Quora to the question Do jellyfish have eyes?, it is said that:
While box jellyfish have eyes, they cannot process images at all because they simply don't have the central nervous system to process images [Source: GRE Biology question I got right].
I heard somewhere though that box jellyfish do have a nervous system and they can see with their eyes.
I have found answers on Quora to be a bit hit and miss with their accuracy and wondered what the facts are.