Challenges and Opportunities of the Human-Centered Design Approach: Case Study Development of an Assistive Device for the Navigation of Persons With Visual Impairment.
Mario Andres Chavarria, Luisa María Ortiz-Escobar, Bladimir Bacca-Cortes and 13 others
PMID 40825539WHAT IT FOUND
Users said travel aids often failed on broken streets, felt uncomfortable, drew unwanted attention, and risked theft.
A first indoor prototype detected head-level objects 91% of the time, but no control group was reported.
Key findings
01Participants said existing travel aids were often useless on damaged streets and caused discomfort, unwanted attention, and theft concerns.
02Ethics and legislation required finalized plans before user involvement, so the team could not engage end users at the start of design.
03In indoor prototype tests, object recognition averaged 91% success, but users said the designs were not discreet enough.
STILL TO COME
How it was doneWhat they foundWhat it means for OTs
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What it does not show
This is a prototype development study, not a clinical trial, so it does not compare the device with a white cane or existing travel aids. The evaluation was small: 19 participants for interviews and Wizard of Oz testing, and 20 users for prototype testing. All tests were indoors in a controlled tented area, so real street conditions were not tested. Participants had to be available for three 1-hour interviews over 18 months and were excluded if they had additional disabilities, so results may not apply to people with multiple impairments or limited availability. Ethics requirements prevented early user involvement, meaning the design was partly based on literature and expertise before formal user engagement. The paper reports only one full iteration of the design process and says several aspects need future redesign. Some detailed results are reported in previous studies rather than fully in this paper.
Declared interests
The authors declared no conflicts of interest.
The easy way to misread this
Do not read the 91% object recognition rate as evidence that the device makes outdoor navigation safe. It was tested indoors with 20 users, had no control group, and the paper describes only an early prototype that still needs redesign.