New research shows sensory decline in older adults is linked to worse mental health and increased loneliness.

Most people — up to 94% of U.S. adults — experience at least some dulling of their senses with age, finding themselves squinting at screens, craving stronger flavours, and missing snatches of conversations more and more frequently.

Researchers at the University of Chicago Medicine are looking into how these changes can go beyond mere inconvenience and actually worsen overall mental health in older adults.

“When your senses decline, you can’t experience the world as well,” said Jayant Pinto, MD, a physician and expert in olfactory dysfunction at UChicago Medicine.

“You can’t hear colleagues or friends at the dinner table; you can’t discern what’s going on in your environment; you may have a hard time reading or making things out when you’re in your neighborhood. It makes all your cognitive burdens a little harder, and that probably wears you down over time and causes mental health problems.”

Along with Alexander Wang, a medical student at the UChicago Pritzker School of Medicine, Pinto recently led a study examining the prevalence and impact of sensory impairments among older adults.

They found that people with sensory disabilities tend to have worse mental health, and that different types of sensory disability were associated with different aspects of mental health.

Revealing associations between perception and emotion

The UChicago researchers analysed data on sensory function (vision, hearing and sense of smell) and self-reported mental health from nearly 4,000 older adults, collected over 10 years of follow-up as part of the National Social Life, Health & Aging Project.

They found that people who had multiple senses impaired experienced more loneliness and had significantly worse self-reported mental health overall, and people with three sensory disabilities were more likely to experience frequent depressive episodes. In analyses that differentiated between the senses, vision impairment was most strongly associated with both loneliness and poor self-rated mental health.

Scientists are still exploring how changes in all five senses can impact people, but the UChicago researchers can already point to many ways sensory decline contributes directly to feelings of loneliness, sadness and boredom.

Older people with vision impairment may have trouble getting out of the house or seeing the faces of their friends and family, and hearing loss can make conversations stilted and frustrating.

Even loss of smell can affect someone’s ability to find joy in familiar scents — like a favourite home-cooked meal or a loved one’s signature perfume — and perceive pheromones, which (though not registered consciously) contribute to social dynamics.

“We saw that hearing and vision disability tended to be associated with lower self-rated mental health and feelings of loneliness, but olfactory disability had a weaker association,” Wang said.

“This stood out to me because hearing and vision disabilities tend to be much more stigmatized than olfactory disability. This made me reflect on the ways in which social stigma may be driving this worse mental health.”

Caring for one another in an aging society

In the face of that stigma, the researchers say their results highlight the importance of improving access to mental health services and increasing awareness of the connection between sensory loss and mental distress.

In particular, understanding how different sensory disabilities impact the long-term mental health of older adults could help healthcare professionals — especially primary care providers, otolaryngologists and ophthalmologists — screen for mental health conditions when they identify sensory loss in their patients, providing opportunities for personalised and timely interventions.

In addition to proactively treating older adults’ mental health, the researchers pointed to steps that can be taken to directly lessen the day-to-day effects of sensory difficulties, which would in turn lessen their negative mental health implications.

“We have an aging society; everybody has a relative who’s getting older and having a harder time in life. It’s a burden for us all to share,” Pinto said.

“Lessening the burdens of your aging relatives and friends can have a huge impact on people’s lives, their productivity and their quality of life.”

On a personal level, family members and friends can help by being patient and finding ways to communicate more effectively, such as speaking clearly or using written notes. On a societal level, public policies and community programs can ensure accessibility in public spaces and provide resources that improve quality of life.

Pinto also highlighted a wide range of technologies and medical interventions are available that can help compensate for sensory impairment. For hearing loss, there are cochlear implants, hearing aids and other hearing-assistive devices — which research has indicated could slow cognitive decline in addition to improving quality of life.

For vision loss, there are glasses, contacts, cataract surgery and LASIK surgery, along with accommodations like text-to-speech computer programs. Even for the sense of smell, health experts can sometimes help by reducing sinus inflammation or conducting smell training exercises.

“In many cases, we can mitigate sensory difficulties in ways that might actually improve people’s lives, mental health and sense of loneliness — which is a huge epidemic,” Pinto said.

“These are simple ways we can intervene to help people and potentially have a huge impact on society.”

Recognising and destigmatising sensory disability

The researchers said they intentionally used the word “disability” throughout the paper to underscore the significant impact of sensory impairments on individuals’ lives. This terminology also aligns with efforts to destigmatise these conditions and promote a more inclusive approach to healthcare.

“To some extent, our society already considers decreased sensory function to be a disability: think of the blind and d/Deaf communities,” Wang said.

“Like many marginalised communities, the disabled community has historically had a very contentious relationship with the medical field, which can cause distress and limit access to mental health services. With better understanding and compassion, we can strive to improve the care we provide to older adults and disabled patients.”

He said that by framing the data this way, he hopes to encourage more healthcare providers to move away from thinking in terms of the Medical Model of Disability and move towards the Social Model of Disability.

“My understanding is that the Medical Model characterises disability as something that is ‘deficient’ with a person, thus requiring some sort of ‘fixing’ of the individual,” he explained.

“The Social Model characterizes disability as more of an identity, so limitations relating to disability stem from a society’s lack of accessibility and accommodation for disabled people.”

Recognising sensory impairments as disabilities and acknowledging their impact on mental health are important steps toward more comprehensive and compassionate care. By addressing the medical, social and environmental barriers that exacerbate these impairments, clinicians — and society as a whole — can better support older adults in maintaining their independence.