double vision usually implies the nerves to the muscles of your eye are being irritated from the MS. Optic neuritis has blurry vision in usually one eye that sometimes can be interpreted as double vision. optic neuritis usually get steroids, starting to work in 1-3 days with maximal effect on days 3-5. double vision may get steroids, but recent evidence suggests limiting steroid exposure is better for optic nerve health long-term.