This paper describes the development and evaluation of a haptic interface designed to provide access to line graphs for bind or visually impaired people. Computer-generated line graphs can be felt by users through the sense of touch produced by a PHANToM force feedback device. Experiments have been conducted to test the effectiveness
of this interface with both sighted and blind people. The results show that sighted and blind people have achieved
about 89.95% and 86.83% correct answers respectively in the experiment.
Besides simpler production process of virtual objects, storage and carrying of digital data are more
convenient than conventional methods. Several attempts have been made to present 3D objects, scientific data and
mathematical functions to blind people using haptic. However, the development of the haptic interface is the major concern rather than the usability
issues.
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