I had “ocular migraines” several years back. Where I’d get tunnel vision or see floaters and spots. MRI revealed it was due to inflammation in my optic nerve. The eye Dr said I likely just got a bug/virus and my immune response triggered the inflammation. He said it can happen to different tissues in the body. When it’s the heart it’s myocarditis. He said it wasnt too worrisome about as it would just go away, which it did quickly and wasn’t ever severe.
I think the point is that it’s a condition which any kind of virus can trigger regardless of the the virus