Accessibility issues in differentiating US currencies.

As a normal person, I always find it difficult to find the difference between a one dollar bill and 10 dollar bill. For blind people, no doubt - even those people find problem in differentiating US currencies.

Its interesting fact that US currencies are the only one country havng same size out of 180 countries.








Problems:

• Same width for all sorts of bills.
• Difficult for blind, normal and tourist to differentiate.
• Even the coins, one dime is small than a cent and 5 cents.
• Configuring millions of currency machine - if new currency is introduced
  

Suggest Usability!!!