A federal judge ruled that US currency is unfair to the blind and should be changed in a way that blind people can distinguish between denominations.

Judge James Robertson said the US Department of Treasury is breaking the law in his ruling on a suit by the American Council of the Blind. He ordered the agency to looking into ways for the visually impaired to tell the bills apart within the next 30 days.

He said the Rehabilitation Act guarantees "meaningful access," which is not being provided by the current system. He recommended creating different sized bills or punching holes in the paper money.

Robertson said this would not be an undue burden for the agency. The Treasury Department had no comment.