  In this paper we provide an explicit expression for the proximity operator of
a perspective of any proper lower semicontinuous convex function defined on a
Hilbert space. Our computation enhances and generalizes known formulae for the
case when the Fenchel conjugate of the convex function has open domain or when
it is radial. We provide several examples of non-radial functions for which the
domain of its conjugate is not open and we compute the proximity operators of
their perspectives.
