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Recent advances in touch screen technology have increased the usability of touch screens for sighted users and prompted a wave of new touch screen-based devices. However, touch screens are still largely inaccessible to blind people because they require the user to visually locate objects on the screen. To address this problem, the authors developed an application called Slide Rule that uses audio output and gesture input to enable blind people to interact with touch screens. This paper describes the design and development of Slide Rule, and a user study in which 10 blind people compared Slide Rule to a button-based Pocket PC.
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