Graham Murray wrote:

Having all banknotes the same size is surely discrimination against
blind people.

Not really. There are plenty of situations in life where one group of
people is advantaged/disadvantaged with respect to another. It's only
discriminatory if it is done either with the desire of causing a
specific outcome of that kind, or else in contravention of relevant
rules that are designed to avoid such an outcome.

That is not to say that the blind and those who lobby on their behalf
couldn't make sufficient noise to shame the US Federal Reserve into
doing something about it.
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http://gallery120232.fotopic.net/p13857120.html
(20 309 at Morecambe, 6 Apr 2005)