Source-linked AI summary
Wearable Assistive Devices for the Blind
Ramiro Velazquez
TL;DR
Blind people face barriers in information access and mobility, alongside limited educational and employment support. This chapter reviews wearable assistive devices and universal design concepts, finding that diverse systems can transmit visual information through hearing and touch. It also identifies sensory overload and long training times as important constraints, while noting that auditory feedback is useful only for reading applications.
Problem
Blindness creates barriers in information access and mobility, while blind people also face high unemployment, limited Braille instruction, and insufficient support resources.
Method
The chapter presents a non-exhaustive survey of wearable assistive devices for the blind and discusses universal design concepts for acoustical and tactile systems.
Results
The reviewed prototypes span body locations and use hearing, touch, or both to support reading, mobility, directional guidance, tactile mapping, and Braille information.
Takeaways & Limitations
Wearable systems provide potential hands-free or reduced-hand solutions for assisting blind users with reading and mobility.
Takeaways & Limitations
Assistive systems may overload a single sensory modality, require long training, and provide acoustical feedback only for reading applications.
Abstract
from arXiv · showhide
Assistive devices are a key aspect in wearable systems for biomedical applications, as they represent potential aids for people with physical and sensory disabilities that might lead to improvements in the quality of life. This chapter focuses on wearable assistive devices for the blind. It intends to review the most significant work done in this area, to present the latest approaches for assisting this population and to understand universal design concepts for the development of wearable assistive devices and systems for the blind.
1 Introduction
Blindness creates major barriers to information access, mobility, orientation, and participation, while existing support systems face substantial social and resource constraints. This chapter reviews wearable and less portable technologies that use hearing and touch to assist reading, mobility, and computer access.
- Blindness is a major barrier to information access, mobility, way finding, environmental interaction, and social interaction.
- Around 75% of blind people in the US are unemployed, and only 10% of blind children receive Braille instruction.
- Rehabilitation services involve many specialists, but funding and qualified personnel are insufficient to meet current demand.
- Assistive technology research addresses information transmission, mobility assistance, and computer access through tools such as tactile displays, electronic travel aids, voice synthesizers, and Braille terminals.
- Wearable devices differ from portable devices by enabling hands-free or reduced-hand interaction through body-worn formats such as head-mounted devices, wristbands, vests, belts, and shoes.
- The chapter surveys wearable and less portable prototypes because wearable assistive technology remains young, experimental, and sparsely represented by mature commercial products.
2 Wearable technologies for the blind
Wearable assistive devices for blind users create hands-free communication channels through hearing and touch, using body locations from fingers and wrists to feet, tongue, and head-mounted systems. Reviewed prototypes support reading, navigation, and environmental interaction, while highlighting training needs, sensory limits, and remaining evaluation questions.
- Overview: Wearable devices transmit visual or environmental information through hearing and touch, using body sites including fingers, wrists, vests, shoes, tongues, and ears.The chapter reviews task-specific prototypes for reading and travel assistance.
- Hearing and touch: Hearing-based substitution must account for sensory overload, because 20–30 minutes of listening can degrade information registration, task performance, posture, and equilibrium.Speech is especially understandable in the ear’s high-sensitivity region around 2–5 kHz.
- Fingers and hands: Finger-worn tactile systems include a flexible EAP display for Braille or visual information and Finger-Braille, which encodes six-dot characters across six fingers.Finger-Braille experiments reported high recognition rates among deaf-blind subjects.
- Wrist and forearm: Wearable tactile displays on the wrist and forearm conveyed alert-like patterns with equivalent perceived comfort and accuracy at both body locations.A Braille watch presents time as raised dial patterns or Braille numbers.
- Head-mounted devices: Camera-based ETAs extend beyond obstacle detection: vOICe maps scene properties to sound, while Intelligent Glasses provide tactile maps for path planning and navigation.Both systems require training, with vOICe potentially taking years to master and Intelligent Glasses users becoming more efficient after training.
- Feet: Foot-based vibrotactile systems support navigation when patterns encode simple directions, but users do not understand vibrations representing more complex shapes.Current work examines long-term effects on balance and walking and performance under cognitive load.
3 Synthesis and conclusions
Wearable assistive devices for blind users use hearing and touch to support daily activities, while universal-design guidance addresses sensory, training, and application-specific constraints. Their adoption also depends on user acceptance and manageable device burden.
- Miniaturized actuators and electronics enable clothing-embedded wearables that support daily tasks without burdensome devices.
- The chapter surveys wearable devices across body locations, including fingers, hands, wrists, forearms, tongues, heads, chests, abdomens, and feet, for reading and mobility.
- Hearing and touch are prioritized for conveying environmental information, so assistive devices provide acoustical and tactile feedback to compensate for missing visual information.
- Universal-design guidance should address sensory overload, lengthy visual-to-sound or visual-to-tactile training, and the differing suitability of feedback modalities for reading versus mobility.
- Acceptance remains challenging because motivation, cooperation, optimism, and willingness or ability to learn or adapt new skills cannot be taken for granted.