PD is a neurological problem but is also secondarily a muscular problem - the nerves that tell the muscles what to do need dopamine to effectively deliver messages. If these mesages can't be delivered, the muscles don't know what the brain is trying to tell them to do. Double vision may have different causes but one cause is muscular. I had double vision as a child and it took both glasses and exercises that built up my eye muscles enough to make my unruly eye muscles to work together like they should. I assume that the practices that worked on my double vision as a child would still be useful . I wonder if an opthalmologist who wirks with children might be able to help you figure out what might help you. As recall, it involved a candle and a prism. You first look at the candle and relax and let your eyes go their separate ways. Then you start trying to pull them together so that the double vision goes away. Then you relax the muscles and you see double again and then wrestle them back together again. Like calesthenics. It's not intrusive or risky. Perhaps an opthalmologist specializing in children may be able to help with that. There may be other factors related to your double vision so it may be useful to pursue those other possibilties with your neurologist and / or General Practioner.