  Gravitational microlensing has proved to be a versatile astrophysical tool.
Recently, the question of whether higher order relativistic corrections can
influence the observable properties of microlensing has been addressed. This
letter extends earlier studies, investigating higher order relativistic terms
in astrometric shifts during microlensing events, revealing that they produce
no effects. The magnitude of the relativistic corrections is examined in an
astrophysical context and is found to be negligible.
