I have chiari I malformation and had to have a VP shunt to allow my spinal fluid to leave my head. I've had a total of 8 shunt surgeries and the pressure in my head before the last surgery caused me to have double vision. It was diagnosed as 6th nerve palsy and I had to wear a patch over one eye a couple of days and for the most part that corrected it. It does come back if I try to read or focus on anyone thing for a period of time. However, it goes away quickly after I look away for a while.