Dan Kaminsky has developed an application that helps the color blind. The augmented app, which is meant for the iPhone, helps color blind people differentiate between colors.
It is useful for the most common form of color blindness, which is called anomalous trichromancy, in which differentiation between red and green color is affected.
This app automatically converts colors in the image which cannot be differentiated by people who are colorblind to colors which can be differentiated by them.
Users can also set filters in the range they are most comfortable with. This app can be brought for $2.99/EUR 2.39 in the Apple app store.