the double vision started off as now and then thruout the day, but after two days of that, became constant. Cannot drive. Was on travatan z for 3 plus years, off for 6 months, then one week after I started it again, the double vision began. Close up... 3 feet or less... is fine, but when I look at anything further away than that, I see 2 of everything. could it have affected the eye muscles ?