Have you seen an ophthalmologist? Dry eyes that are caused by Sjogren's or other AI diseases can cause changes in vision. Using Restasis has helped me.
It might be a good thing to rule out before thinking about any other CNS issues that might be causing it.
I also have Meniere's Syndrome, so I'm often dizzy and unsteady on my feet. I never go anywhere without my cane, unless I'm holding onto DH's arm.