I was pleased to read that a Federal US court has decided that the US currency system (dollar bills) is not fair for use by blind people. Other countries use bills of different sizes or have raised text on the bills so that people without the use of their eyes can distinguish different denominations.
I remember (from the movie Ray) that Ray Charles used to ask to get paid in singles so that he could know for sure that he was paid the proper amount. Since that time, every denomination of dollar bill except the single has been revised with new security features, but none of them have introduced any “accessibility” features so that the blind could tell them apart.