 VEPs were assessed 5 times during a total period of 360 days: at baseline conditions 0 day, after two different cycles of 60 days of treatment days 0-60 and days 180-240, and after two different cycles of 120 days of wash out days 60-180 and 240-360. In NT-AOG patients, VEPs were assessed at baseline conditions 0 day and after 60, 180, 240 and 360 days. 