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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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Development of an Audio-based Virtual Gaming Environment to Assist with Navigation Skills in the Blind
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VISTATM: Visual Impairment Subtle Touch AidTM - a range detection and feedback system for sightless navigation.

Bassil Ramadan1,2, Wolfgang Fink2, Andres Nuncio Zuniga2

  • 1Department of Neuroscience and Cognitive Science, University of Arizona, Tucson, AZ, USA.

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|October 29, 2021
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Summary

This study introduces a low-cost, wearable device that uses ultrasonic sensors and vibrations to help visually impaired individuals navigate by detecting obstacles. The navigational aid enhances traditional white cane use for improved mobility and safety.

Keywords:
Visually impaired personsassistive devicesensory prosthesestactile sensationultrasonic sensors

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Area of Science:

  • Assistive Technology
  • Biomedical Engineering
  • Human-Computer Interaction

Background:

  • Visual impairment presents significant mobility challenges.
  • Existing assistive devices often have limitations in cost, intrusiveness, or effectiveness.
  • There is a need for integrated solutions that augment traditional mobility aids like the white cane.

Purpose of the Study:

  • To develop and validate a low-tech, low-cost navigational aid for individuals with visual impairments.
  • To create a device that complements standard white cane usage.
  • To provide real-time obstacle detection and spatial awareness feedback.

Main Methods:

  • A wearable system comprising a sensing belt with adjustable ultrasonic sensors and a stimulation belt with proportional vibrating motors was designed.
  • Ultrasonic sensors measured distances to surrounding obstacles.
  • Vibrational feedback intensity correlated with proximity to obstacles.

Main Results:

  • Preliminary testing demonstrated the device's capability to inform users about surrounding obstacles in real-time.
  • The system effectively supported navigation in a novel hallway environment with turns.
  • Users received timely spatial information through proportional vibrations.

Conclusions:

  • The developed ultrasonic-sensor and vibration-actuator belt system is a promising navigational aid for the visually impaired.
  • The device offers a minimally obtrusive and robust solution to enhance mobility.
  • This technology has the potential to improve independence and safety for individuals with visual impairments.