Vision Measures in Aging Cohorts: Gaps and Opportunities

There is wide variation in the methods used to assess vision across existing aging cohort studies. While subjective vision measures are valuable in capturing individuals’ perspectives, objective criteria are often needed to fully characterize visual impairment in older adults. In addition, visual function extends beyond acuity; contrast sensitivity, visual fields, and depth perception are known to impact daily functioning, and are needed to comprehensively assess visual function. Broader uptake of subjective and objective vision measures, and harmonization of vision measures across datasets is needed to robustly examine the role of visual impairment on aging and health outcomes. In this presentation, we will draw on work using data from the National Health and Aging Trends Study, Health and Retirement Study, and Health, Aging and Body Composition Study, among others, to illustrate uses of vision data in aging cohort studies, and examine the gaps and opportunities for improvement in vision measures. Part of a symposium sponsored by Sensory Health Interest Group.

The Association of Vision, Hearing, and Dual Sensory Impairments With Walking Speed and Incident Slow Walking

Vision (VI), hearing (HI) and dual sensory (DSI, concurrent VI and HI) impairments are increasing in prevalence as populations age. Walking speed is an established health indicator associated with adverse outcomes, including mortality. Using the population-based Health and Retirement Study, we analyzed the longitudinal relationship between sensory impairment and walking speed. In multivariable mixed-effects linear models, we found differences in baseline walking speed (m/s) by sensory impairment: Beta=-0.05 (95%CI=-0.07, -0.04), Beta=-0.02 (95%CI=--0.03, -0.003), and Beta=-0.07 (95%CI=--0.08, -0.05) for VI, HI and DSI, respectively, as compared to those without sensory impairment. However, similar annual declines (0.014 m/s) in walking speeds occurred in all groups. In time-to-event analyses, events were defined as “slow walking” (speed <0.60m/s) and “very slow walking” (<0.40m/s). Incident “slow walking” was 43% (95%CI=25%, 65%), 29% (95%CI=13%, 48%) and 35% (95%CI=13%, 61%) greater in VI, HI and DSI, respectively, than the no sensory impairment group, while incident “very slow walking” was 21% (95%CI=-4%, 54%), 30% (95%CI=3%, 63%) and 89% (95%CI=47%, 143%) greater; the increase was significantly greater in DSI than VI and HI. These results suggest that older adults with vision and hearing impairments walk slower and are at increased risk of slow walking than older adults without these sensory impairments. Additionally, older adults with DSI are at greatest risk of very slow walking.

Self-Reported Uptake of Clinical Preventive Services by Vision Impairment Status

Disease prevention is central to healthy aging. People with vision impairment are more likely than those without to report barriers to accessing health care and have unmet health care needs. We examined the association between functional vision impairment and preventive care uptake among adults aged 65 years and older in the 2016 and 2018 Behavioral Risk Factor Surveillance System (BRFSS) survey. The outcome of interest was being up-to-date with the recommended core clinical preventive services, as defined by Healthy People 2020: influenza and pneumococcal vaccination, and colorectal cancer screening for men, with the addition of breast cancer screening for women. Self-reported vision impairment was defined as blindness or serious difficulty seeing, even when wearing glasses. In models adjusted for sociodemographic characteristics (including age), access to care, and health/functional status, there was no difference in the odds of reporting being up-to-date with the recommended core preventive services among men with vision impairment compared to those without (odds ratio [OR]=0.90, 95% confidence interval [CI]=0.8-1.01); however, men with vision impairment were 0.82 times (95% CI=0.71-0.94) less likely than those without to report being up-to-date with colorectal cancer screening. Women with vision impairment were less likely than those without to report being up-to-date with the recommended core preventive services (OR=0.77, 95% CI=0.69-0.87); among the different services, the odds were lowest for reporting breast and colorectal cancer screening. These findings suggest that to achieve higher rates of preventive care uptake, especially cancer screening, older adults with vision impairment may be a special group to target.

Satisfaction With Health Care by Dual Sensory Impairment Status

Sensory impairment is a barrier to patient-provider communication and access to care, which may impact satisfaction with care. Satisfaction with the quality of care received in the past year was assessed in the 2017 Medicare Current Beneficiary Survey (weighted sample=53,905,182 Medicare beneficiaries). Self-reported sensory impairment was categorized as no sensory impairment, hearing impairment (HI)-only, vision impairment (VI)-only, and dual sensory impairment (DSI) – concurrent HI and VI. In a model adjusted for sociodemographic characteristics and health determinants, having DSI was associated with higher odds of dissatisfaction with the quality of care received (Odds Ratio [OR]=1.53, 95%Confidence Interval [CI]=1.14-2.06) relative to no sensory impairment; however, having HI-only or VI-only were not (OR=1.33, 95%CI=1.94-1.89, and OR=1.32, 95%CI=0.95-1.93, respectively). These findings have implications for healthcare providers as Medicare shifts to value-based reimbursement. Moreover, previous work that singularly focused on HI or VI alone may have failed to recognize the compounded effect of DSI.

The Association of Sensory Impairment With Incident Disability-Related Cessation of Employment in Older Adults

Sensory impairment (SI) is common among older adults, and it is an increasingly important public health challenge as the population ages. We evaluated the association between SI and incident disability-related cessation of employment in older adults using the population-based Health and Retirement Study. Participants employed in 2006 completed biennial interviews until self-reported incident disability-related cessation of employment. Participants were censored at loss to follow-up, retirement, or 2018. Participants rated their vision and hearing, using eyeglasses or hearing aids if applicable, on a Likert scale (poor, fair, good, very good, excellent). SI was defined as poor or fair ability, and SI was categorized as neither SI (NSI), vision impairment alone (VI), hearing impairment alone (HI), and dual SI (DSI). Cox proportional hazard regression assessed the association between SI and incident disability-related cessation of employment, adjusting for demographic and health covariates. Overall, 4726 participants were included: 421 (8.9%) were with VI, 487 (10.3) with HI, and 203 (4.3%) with DSI. Mean age was 61.0 ± 6.8 years, 2488 (52.6%) were women, and 918 (19.4) were non-White. In the fully adjusted model, incident disability-related cessation of employment over the 12-year follow-up period was higher in VI (Hazard Ratio (HR)=1.30, 95% confidence interval (CI)=0.92, 1.85), HI (HR=1.60, CI=1.16, 2.22), and DSI (HR=2.02, CI=1.38, 2.96). These findings indicate that employed older adults with SI are at increased risk of incident disability-related cessation of employment, and that older adults with DSI are particularly vulnerable. Addressing SI in older adults may lengthen their contribution to the workforce.

The effects of temperature on short-term mortality risk in Kuwait: A time-series analysis

BACKGROUND

In light of climate change, health risks are expected to be exacerbated by extreme temperatures. Many studies showed that high and low ambient temperatures are associated with increased short-term mortality risk, but little is known about these risks in Kuwait and the Gulf Region.

OBJECTIVE

To examine the dose-response relationship between 24-h average ambient temperatures and daily mortality risk in Kuwait.

METHODS

We gathered mortality and meteorological data from 2010 to 2016 in Kuwait. We did a time-series analysis using a negative binomial distribution, and studied the lag effects of temperature with distributed lag non-linear models.

RESULTS

A total of 33,574 all-cause non-accidental deaths were analyzed. The relationship was shown to be non-linear. Overall relative risks of death comparing the 1st percentile (10.9 °C) and the 99th percentile (42.7 °C) to the optimum temperature were 1.67 (1.02-2.73), and 1.65 (1.09-2.48), respectively. Cold effects persisted for 9 days, while the effects of hot temperatures were the highest at lag 0 and only persisted for a week. Adjusting for PM₁₀ and ozone did not change the temperature-mortality estimates.

CONCLUSION

Our findings show evidence that there is a statistically significant positive association between temperature extremes and mortality in Kuwait. The evidence has significant implications in assessing climate vulnerability and provides insight into environmental challenges in an inherently hot and arid region.