Hearing Aids Do Not Help Blind People Navigate, and That Is a Problem
Johns Hopkins Medicine
About 7 million adults in the United States live with vision loss or blindness. Around 30 million have hearing loss in both ears. The overlap between these two groups grows sharply with age, yet researchers know remarkably little about how losing both senses affects a person's ability to move through the world. A new study from the Wilmer Eye Institute at Johns Hopkins Medicine starts to fill that gap, and its findings point to a significant unmet need in rehabilitation.
When the backup system fails
People who are blind rely heavily on sound to navigate. Echoes off walls, the hum of traffic, footsteps of nearby pedestrians, the acoustic signature of a large room versus a narrow hallway: these cues form a spatial map that replaces visual information. Sound localization, the ability to identify where sounds are coming from, becomes essential for tasks as basic as crossing a street or finding a doorway.
What happens when that auditory backup degrades? The study, published in PLOS One, recruited 58 adults with total or near-total blindness. Twenty-eight reported typical hearing. Thirty reported some degree of hearing loss. Nearly all participants (94%) had received formal orientation and mobility training, the specialized rehabilitation that teaches blind individuals to build mental maps of their surroundings and navigate safely.
Each participant completed the Dual Sensory Spatial Localization Questionnaire (DS-SLQ), a tool developed by the research team to measure both perceived and performed spatial localization abilities during everyday tasks.
Confidence drops with hearing loss, and timing matters
The pattern was clear. Adults who had been blind from early in life but had typical hearing reported the highest confidence in their spatial skills. Those with both blindness and hearing loss reported lower confidence. And among people with dual sensory loss, those who lost their hearing early in life scored lowest of all.
The timing of hearing loss onset, not just its severity, was a key determinant. People who became blind early and then developed hearing loss later had adapted their spatial awareness around sound for years or decades. Losing that sense, even partially, meant losing the foundation of their navigation strategy. Those who experienced hearing loss early never had the chance to build that auditory foundation in the first place.
Prachi Agrawal, the study's first author and a postdoctoral fellow in the lab of senior author Yingzi Xiong, noted that people with dual sensory loss may feel less motivated to adopt new hearing strategies for everyday tasks. Identifying these barriers, the researchers argue, gives providers concrete targets for individualized rehabilitation.
Hearing aids are not solving the navigation problem
Here is perhaps the study's most practically important finding: adults who used hearing aids did not report higher confidence or navigational skills than those without hearing aids. This aligns with prior research from the same group and highlights a significant gap in hearing aid technology.
Current hearing aids are engineered primarily to improve speech perception. They amplify and process sound in ways optimized for conversation, not for spatial awareness. The algorithms that make speech clearer in a noisy restaurant may actually interfere with the kind of ambient sound processing that a blind person uses to understand their physical environment. Directional microphones, noise cancellation features, and frequency adjustments that are beneficial for understanding speech can strip away the very spatial cues a blind person depends on.
Xiong, who directs the Multisensory Research Lab at the Wilmer Eye Institute, was direct about the implication: patients did not report that commercially available hearing aids were helpful for navigating their environment. If roughly 40% of patients seeking vision rehabilitation in the United States also have hearing loss, as Xiong estimates, then the rehabilitation system needs to account for hearing status as a central variable, not an afterthought.
A population that falls between specialties
People with dual sensory loss occupy an uncomfortable gap in the healthcare system. Vision rehabilitation specialists may not assess hearing. Audiologists may not consider how their patients use sound for spatial navigation. The result is that a substantial population receives fragmented care that addresses each sense in isolation rather than understanding how the two interact.
The researchers recommend that clinicians assess hearing status during vision rehabilitation and specifically identify areas of fear or hesitancy that might be addressed through tailored intervention. A patient who avoids busy intersections because they cannot localize the sound of approaching cars needs a different rehabilitation strategy than one who struggles with conversation in a noisy room.
Limitations and next steps
The study measured self-reported confidence and perceived ability, not objective performance in controlled navigation tasks. People's assessments of their own skills may not perfectly match their actual capabilities. The sample size of 58, while reasonable for this type of research, limits statistical power to detect smaller effects. And because the study is cross-sectional, it cannot establish whether hearing loss directly caused reduced navigational confidence or whether other factors, such as age, health, or social isolation, contributed.
The study was also conducted in the United States, where orientation and mobility training is relatively accessible. Findings might differ in countries where blind individuals receive less rehabilitation support.
What the study does establish is a clear signal that dual sensory loss creates compounding challenges that neither hearing aids nor standard vision rehabilitation fully address. For a growing population of older adults who are losing both senses simultaneously, the need for integrated, cross-specialty care is becoming harder to ignore.