Eye exams notwithstanding, there aren't regular tests or scans to see if the surgeries or chemo or any other treatments worked. You just wait for symptoms of metastasis. It's kind of like getting your house treated for termites and then after that, the exterminator just parks, looks at your house from the street, and says, "Nope, don't see any termites from here so we're going to call that 'termite-free.' But call if your house starts to fall down!"
Yeah, you know it battled me.
But it did not win,
I'm still standing, don't you see?"