Yes you do need a neuro-ophthalmology exam TO FIND OUT WHY YOU HAVE DOUBLE VISION. Only after a reason is found can treatment be considered.
JCH II IMD
I have had double vision surgery myself, prisms could not correct my vision. It does help but still 10% of the time i still see double. The surgery also made me seem to be more senseative to bright lights. But I had not other choice but surgery if prisms work for you i would say by no means have the surgery.
Yes, IMO, you definitely should try to find out why you have double vision. There are many possible causes. See a neuro-ophthalmologist or a strabismus specialist. Depending on the cause, it's possible that your double vision could be eliminated by a simple surgical procedure or even a Botox injection.