Here is a link to a government site with an up-to-date on Optic Neuritis and treatment which should give you the information you need; http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3178158/
There are some clinical trials underway in Japan, but from what my friends in Japan have said, it is not promising. ON was once predominant in Japan among those with ON or MS; therefore, that was a research area the Japanese researchers were evaluating. As MS cases in Japan have increased, less funding is now available for ON.
If ON is your only diagnosis, any of the MS DMDs would not likely be made available to you because you do not have MS. I hope that your doctor monitors you closely to assure that your ON does not develop into MS.