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My advice is anecdotal.  A  friend of a friend
told me he had a "black hole" in the center of his
right eye visual field.  He said it was melanoma
and curable with a radioactive implant the size of
a nickel (American coin) placed behind the eyeball
for a short period of time. He said the operation
could be done at M.D. Anderson for $10,000 and
that he qualified as an indigent if he could come up
$3000 cash to get things moving. I asked him if the
"black hole" had recently doubled in size. He said
that melanoma is not a cancer that doubles
periodically but grows larger incrementally.
David H
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