The goldfish's eyes suddenly disappear, which may be eaten by other fish. Although goldfish have the ability to resist diseases, their physique and physical strength will deteriorate after they get sick. So when they get sick, it is difficult for them to resist the attack of other fish, and they will be eaten by other fish.

It is also possible that the eyeball falls off due to parasitic infection. Goldfish's eyes are very fragile and can be easily infected by parasites. If they are infected with parasites and are not treated in time, their eyes will become more and more serious, and they will fall off later.

Goldfish can live without their eyes, but after they have lost their eyes, they will not grow again. Because eyes do not have much effect on the normal life of goldfish, although they can see things, they can only see a vague outline, so without eyes, they will not have much impact on their normal activities, and they can survive normally.

When cultured artificially, if goldfish's eyes are found to have fallen off, it is best to smear anti-inflammatory drugs around the eyes first, or give them a medicated bath with antibiotics. As long as the injury around their eyes recovers, there will be no danger to their lives.