 When Lelouch converses with Charles and Marianne in episode 21, it is revealed that Nunnally's injuries were orchestrated by V.V., who set her up to be a false witness to the murder of her mother.Her blindness, which was thought to be a result of the traumatic assassination of her own mother, was actually induced by Charles' Geass, in order to protect her against possible reprisal by V.V before sending both her and Lelouch away to Japan.However, since Charles went ahead with his war and did not care about their subsequent fate, Lelouch concluded that they were less important than his grand plan