Anytime a filler is injected in the face, it is possible to cause blindness. It is very rare, but possible. There are a few techniques that can be used to decrease the chance of this such as using a cannula.
One must take extra precaution when injecting fillers anywhere in the face but particularly around the eyes. if the material is inadvertently injected into a blood vessel, it could travel to the vessels that deliver blood to the optic nerve which can cause loss of vision. This is an extreme;ly rare event, but it can happen. So one should be mindful of this even when treating the nose.
There is always a small risk of blindness when injecting juvederm or other fillers around the nose or eyes. Certain areas of the nose are very low risk as there are no major vessels that you could get into which lead back to the eye.