I am glad you got a diagnosis, even though it is a very worrisome one for you. Now that you know, a visit or referral - sooner rather than later - to a Neuro ophthalmologist is your next step - can be hard to find except in a larger metro area, but my friend saw one for a related optic neurotic, and regained some of he damaged vision. This is also the place to get advice about protecting your other eye.
Good luck and let us hear how you progress.
Sue