Now blind can find out currency denominations by photographing the currency on phone and the phone resolves and reads out the denomination aloud to the blind. Nokia came out with a phone with software capability to convert text in Menu's et a; to english and it can even translate the same into other language. Federation of Blind developed it in US.
So finally the blind can be independent and need not depend on help from others. Till artificial vision develops they may have to do with it.