Hi Stu. I am 46 and have had double vision with my Ataxia for over 10 years. I have gone past the amount of prism that could be put into my glasses and my eye Dr. and I decided to try occlusion therapy with my latest glasses. The double vision is gone. It's taken some to get used to, being able to see out of only one eye, and I get some weird looks being that one lens is "foggy", but there is that to fall back on when prisms stop working.