That seems to overstate the case. A slight modification to existing bills woulddo the trick.
In Canada the bills are stamped with a braile symbol causinbg slight bumps that can be 'read'. Seems easy enough.
I just had a counterfeiting idea...
And I bet I'm not the only one.
I'm thinking there is a market to be made by creating a stamping machine that can be sold to banks so they can imprint the currency with braille bumps to give out to blind clients to use. The US Treasury won't have to spend an extra dime and some smart bank can corner the market on blind customers! And if this blind lawyer is right and suddenly half of america is going blind, then some bank is going to get richer than hell! A free market solution will beat the hell out anything the Treasury comes up with and for trillions less.