I was on oral steroids (prednisone) and it does help the vision a lot, haven’t heard anything about the intravenous method tho.
In my case, the steroids actually made the double vision worse. At first I just had ocasional double vision mostly when I looked to the side. Two days after starting me on the prednisone, the double vision got bad and it has been that way ever since.
There are lots of side effects to the steroids so be sure you are clear on what they can be. The side effects can really limit how much of the drug you can handle, therefore its effectiveness.