O&M Indoor Virtual Environments for People Who Are Blind: A Systematic Literature Review
Agebson Rocha Façanha, Ticianne Darin, Windson Viana, Jaime Sánchez · 2020 · ACM Transactions on Accessible Computing · doi:10.1145/3395769
Summary
This systematic literature review examines virtual environments designed to support indoor orientation and mobility (O&M) training for people who are blind. The authors analyzed 51 papers describing 32 distinct O&M virtual environments, filtering from an initial pool of 987 papers across six databases. The review addresses seven research questions covering multimodal interfaces, design requirements, usability evaluation techniques, participant profiles, cognitive impact assessment, usage contexts, and map editing tools. O&M virtual environments aim to help users develop mental maps of indoor spaces before physically navigating them—a critical skill since people who are blind cannot rely on visual cues to build spatial representations. These systems typically simulate real-world indoor spaces (buildings, schools, museums, hospitals) using 3D audio and haptic feedback, allowing users to explore virtually and then transfer that spatial knowledge to real-world navigation. The review spans research from 2002 to 2020, with publication activity peaking in 2018.
Key findings
All 32 virtual environments use audio for interaction, with 3D spatial audio being the dominant approach for simulating object positions and distances. Joysticks are the most common input device (59.38%), followed by touch screens (31.25%), with haptic feedback provided by 68.75% of systems using devices like Phantom Omni and Novint Falcon. Desktop platforms dominate (59.38%), though mobile platforms are growing. The review identified no standardized reference model for O&M virtual environment design. Requirements were categorized into five areas: Audio (3D audio, audio icons, movement sounds), Haptics (control, tactile feedback), Spatial Information (positioning, prioritization, density, scale), System (customization, difficulty levels, logging), and Visual (universal design, debugging, zoom, contrast). Only 13 papers (25.49%) demonstrated positive cognitive impact from virtual environment usage through experiments. Common assessment methods include real-world navigation tasks (53.85%), verbal descriptions (46.15%), and map reconstruction with toy bricks (61.54%). Notably, MRI studies showed that blind users displayed brain activation patterns in spatial processing areas similar to sighted individuals. Participants are typically adults aged 21-59 with at least two years of visual impairment and prior O&M training. Only four papers (7.84%) reported indoor map editors, highlighting a significant gap.
Relevance
This review provides practitioners with a comprehensive overview of design patterns and evaluation approaches for O&M virtual environments. The synthesis of requirements across Audio, Haptics, Spatial Information, System, and Visual categories offers a practical framework for developers. The finding that all systems use audio—with 3D spatial audio being most effective—confirms its essential role in non-visual navigation interfaces. Key gaps identified include: lack of standardized design guidelines, few customizable map editors (limiting scalability), underrepresentation of children and older adults in studies, and insufficient focus on user experience beyond basic usability. The review also notes that 8 papers used sighted blindfolded participants rather than people who are actually blind, which can bias results. For organizations developing O&M training tools, this review serves as both a state-of-the-art reference and a roadmap for addressing current limitations in the field.
Tags: orientation and mobility · O&M training · virtual environments · blindness · visual impairment · spatial audio · haptic feedback · wayfinding · mental maps · systematic review