The vacuum polarization result in QED seems to always be written in a "QED form". I would be interested in seeing it in an old-fashioned classical physics form. Without vacuum polarization the electric potential in a region containing a point charge is of course Q/r. So if the vacuum polarization is included the potential must be of some form Q f(r) where f(r) is no longer 1/r. So what specifically would f(r) be? Thanks.