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This paper presents Finger Based Technique (FBT) prototypes, a novelinteraction system for blind users, which is especially designed and developedfor non-visual touch screen devices and their applications. The FBT prototypeswere developed with virtual keys to be identified based on finger holdingpositions. Two different models namely the single digit FBT and double digitFBT were propounded. FBT technique were applied using two different phonedialer applications: a single digit virtual key for the single digit FBT modeland a double digit virtual key with audio feedback enabling touch as inputgesture for the later one. An evaluation with 7 blind participants showed thatsingle digit FBT was significantly faster and more accurate than double digitFBT. In addition to that, single digit FBT was found to be much faster thaniPhone VoiceOver entry speeds in performing similar tasks. Furthermore, ourresearch also suggests 11 accessible regions for quick access or navigation inflat touch screen based smart phones for blind users. These accessible regionswill serve as a usability design framework and facilitate the developers toplace the widget for the blind user for dynamic interaction with the touchscreen devices. As far as is known to the authors, this is a novel suggestion.

Finger Based Technique (FBT): An Innovative System for Improved Usability for the Blind Users' Dynamic Interaction with Mobile Touch Screen Devices