Jordan sees in only black and white because she was destined to lead a more colorful life in The Mandala. The quotidian world is too tainted to hold such pure color, and her pure eyes are unable to comprehend such corrupted colors and appearances. Those from the dark side of The world appear pitch black, while those from the Mandala appear in full, vivid color.
For as long as you can remember, you've worn eyeglasses. Your parents always made sure you had them on and you formed the habit. One day, you forget them and you realize you can see something no one else can.