>>>I can’t see how this is true.
I can understand the ruling. For several years I worked in a legal division at the state capitol. The first day at lunch I handed the cafeteria lady a banknote and a co-workers pointed at her own eyes, telling me this was a blind person. I had to tell the lunchlady the denomination.
It had never occurred to me before the problem the blind have with all banknotes seeming the same to the touch.