Can the "base" of the nose bridge be narrowed?

Thanks for your question.  The answer is yes, the nasal bones can certainly be narrowed.  It would be helpful to see some photos to answer your question more specifically as there are some variables that need to be considered to more definitively answer.  Best wishes.

Hello and thank you for your question.  The best advice you can
receive is from an in-person consultation.  It is certainly possible to narrow the nasal bone as you describe.   Make sure you specifically look at before and after pictures of real
patients who have had this surgery performed by your surgeon and not just a
computer animation system. The most important aspect is to
find a surgeon you are comfortable with. I recommend that you seek consultation
with a qualified board-certified plastic surgeon who can evaluate you in
person.
Best wishes and good luck.
Richard G. Reish, M.D.
Harvard-trained plastic surgeon