Secondly, there is absolutely no feasible or pragmatic way for a blind person to tell what denominations are passing through his hands. Not sure if you mean "using current money" or under any circumstances, but in some countries different denominations are different sizes, just as coins are here.
The first question a blind person must ask as he or she manipulates money is "is this money or is it something else".
It's much easier to counterfeit the feel of money than the look.