I just had MRI yesterday and the result was out today. There are 2-3 small new lesions

My neuro informed me that now he suspected that I might have ODM instead of MS since most of my relapzes that I am experiencing is Optic Neuritis.
He did not explain in detail yet on the phone what is ODM. He just told me ODM mostly attach the eyes and the spine. He wants me to take some blood test. The blood test would be done in the US for as Singapore is yet to have that kind of test. Tried to google it but could not get much details.
Any of you have info on ODM?
My neuro told me that the medication for ODM is much much more lower than Rebif. Well, at least that's kinda good to know