An empirical investigation of the situationally-induced impairments experienced by blind mobile device users
Ali Abdolrahmani, Ravi Kuber, Amy Hurst · 2016 · Proceedings of the 13th International Web for All Conference (W4A) · doi:10.1145/2899475.2899482
Summary
This paper investigates the situationally-induced impairments and disabilities (SIIDs) experienced by blind people when using mobile devices in real-world contexts. While prior SIID research has focused on sighted users encountering temporary impediments (like walking while texting), this study uniquely examines how environmental, contextual, and situational factors compound the existing accessibility challenges faced by blind mobile users. The researchers conducted semi-structured interviews with eight legally blind participants (ages 20-49, all iPhone/VoiceOver users), presenting three scenarios—shopping while carrying bags, using public transportation, and checking notifications in meetings—to inspire discussion about situational barriers. All participants used canes or guide dogs for mobility, meaning one hand was always occupied, fundamentally changing the dynamics of mobile interaction compared to sighted users. The study revealed that blind users face a compounding effect: the situational impairments experienced by all mobile users (noise, encumbrance, motion) are layered on top of the existing accessibility challenges of using a touchscreen without vision, creating qualitatively different and more severe interaction barriers.
Key findings
Nine themes emerged from the interviews. Using a phone while walking with a cane (7/8 participants) was a major challenge because VoiceOver gestures require two or three fingers, making one-handed use far more difficult than the simple swipes sighted users perform. Experienced users strategically repositioned app icons for thumb-only access. On public transportation (6/8), bumpiness caused typing errors with VoiceOver touch typing, dictation failed due to ambient noise, and participants feared phone theft since they could not visually assess their surroundings. Three participants reported ambient noise completely masking phone audio even at maximum volume, causing missed urgent notifications. Inhospitable weather (5/8) created additional barriers—gloves prevented touch interaction, wind distorted microphone input, and hats attenuated screen reader audio. In social settings (6/8), participants struggled with tasks sighted people do easily, like discreetly checking the time or reading a restaurant menu, since screen reader output draws attention. Privacy and safety concerns were pervasive: participants modified behavior to avoid being overheard, worried about appearing different, and feared vulnerability when using phones in public. Participants suggested four design directions: improved hands-free voice interaction, immediate contextual feedback (e.g., camera lighting conditions before taking a photo), context-aware sensing using device sensors to detect movement and ambient noise, and multimodal output combining tactile and auditory feedback.
Relevance
This study makes an important contribution by extending the concept of situational impairment to populations already experiencing disability—a perspective largely missing from prior SIID research that focused on healthy young adults. The findings are directly relevant to mobile app developers and UX designers: VoiceOver's multi-finger gesture requirements create a fundamentally different one-handed interaction problem than sighted users face, ambient noise creates a more severe barrier when audio is the primary output channel, and privacy concerns are heightened when screen reader output is audible to bystanders. The rich qualitative accounts—particularly the grocery shopping narrative showing a participant cycling through four increasingly complex workarounds—powerfully illustrate how blind users must constantly strategize and plan around barriers that sighted users never consider. The design implications around context-aware sensing, multimodal feedback, and improved voice interfaces remain relevant for current mobile accessibility work. The main limitation is the small sample size of eight participants, though the depth of qualitative data partially compensates for this.
Tags: situational impairment · mobile accessibility · visual impairment · blindness · screen readers · VoiceOver · user research · qualitative research