Neovascularization is sometimes a consequence of using soft contact
lenses with inadequate oxygen permeability and the body's response to
that. It does not happen to all contact lens wearers and when it is the
result of contact lens use, it must be addressed. Some people who use
low oxygen permeability lenses don't get it and rarely, some people who
don't wear lenses at all do!  In any event, the solution is to switch to
a lens with improved oxygen transmission (the silicone hydrogel group a
perfect example) or discontinue lens wear.

Neovasc is a condition at the extreme edge of the cornea (no competent
practitioner would allow conditions to persist that would let it advance
further) and halos and starbursts are not related symptoms. Those can be
the result of swelling of the cornea (also possibly as a result of
inadequate oxygen) or a lens optic zone smaller than your pupil.  

Your practitioner should be able to easily determine the cause(s) and
recommend appropriate remedies.  The neovasc if halted may go away and
not likely ever interfere with vision. The other symptoms also can be
resolved.

--LB, O.D.