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For those unable to see information on a computer screen, there is screen reading software available that either reads out the text or converts it to Braille. Users can also interact with computers via a large number of keyboard shortcuts. Such technologies can be useful in conveying text, but are not as helpful when it comes to graphical information. Yet graphical information, in the form of maps, pictures and graphs, is an important way of communicating large amounts of data quickly, both in overview and detail. While this data can be read out by a screen reader, it can be laborious, and the ability to gain an instant sense of the salient points of the graphic is lost.
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