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Visual impairment and age-related eye diseases in Adults

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This article explains visual impairment and age-related eye diseases in Florida:

Findings from 2006 Behavioral Risk Factors Surveillance System (BRFSS) in Nine states

 

Introduction

Visual impairment caused by age-related eye diseases affects an estimated 3.3 million people among adults aged 40 years and older in the United States.1 This disability is one of the most common public health issues among the elderly because it decreases quality of life by affecting daily living independence,2,3increasing the risk of injury,4,5 causing depression and social isolation.6,7 The aging of America’s population will increase the burden of visual impairment on the society in coming decades.

Florida was ranked in the 1st place in the proportion of people aged 65 years and older in the United States.8 Based on this fact, one might assume the burden of age-related eye disease in Florida would be higher. However, it had long been observed that elderly Floridians demonstrated better health compared with their counterparts in other regions across the nation.9,10 While many previous estimates on the prevalence of age-related eye diseases were obtained at the national level,1114 few studies conducted were state-based studies. Since elderly Floridians already possessed the reputation of being healthier, we aimed to examine any differences with respect to visual impairment, prevalence of age-related eye disease as well as coverage and utilization of eye care services between Florida and other states across the nation. We also explored the possible reasons for these differences.

Methods

Data source

Data for the study were obtained from the Behavioral Risk factor Surveillance System (BRFSS). The BRFSS is a state-based, random-digit dialed ongoing telephone survey of the noninstitutionalized United States civilian population aged ≥18 years. State-specific information about behaviors that are associated with preventable chronic diseases, injuries, and infectious diseases makes the comparison of health behaviors among states possible.15 The BRFSS questionnaire includes three parts: the core components, optional modules, and state-added questions. All fifty states and three territories use an identical core questionnaire to conduct the interviews. In addition, states may choose to include optional modules in their data collection, which are sets of questions on various specific topics.15

Among the optional modules is the visual impairment and access to eye care module, which collects information regarding the status of visual acuity, eye care service utilization, and professional diagnosis of age-related eye diseases and eye injury. Previous researches have used items in the module to estimate visual impairment at national16 and state level.17 In 2006, nine states (Arizona, Connecticut, Florida, Georgia, Nebraska, New York, Ohio, Texas, and Tennessee) administered this module. The response rate ranged from 39.8% to 66.0% for these states. The questions were asked of respondents aged 40 years and older. However, the current analysis was restricted to people aged 65 years and older in order to compare the interesting variables among the aging population. In this study, Florida had more aging people, with 22.2% of the population aged 65 years and older versus 16.0% for the other states.

Variable definitions

Vision impairment

Vision impairment included two questions regarding distant and near vision, respectively: “How much difficulty, if any, do you have in recognizing a friend across the street?” and “How much difficulty, if any, do you have reading print in newspaper, receipts, or numbers?” The response was categorized as “no difficulty”, “moderate difficulty”, and “extreme difficulty” in descriptive analysis, and was dichotomized as “no difficulty” vs “any extent of difficulty” in the logistic regression analysis. Respondents with “no answer” or “refused to answer” or with the answers “unable to do for other reasons” or “not applicable (blind)” were excluded from analysis.

Age-related eye diseases

Age-related eye diseases were affirmed by respondents who indicated they “had been told by an eye doctor or other health care professional” that they had cataract, glaucoma, age-related macular degeneration or diabetic retinopathy.

Eye care insurance coverage

Respondents were classified as not having eye insurance if they answered “no” and as having eye insurance if they answered “yes” to the question, “Do you have any kind of health insurance coverage for eye care?”

Eye care visits in the preceding 12 months and the reasons for not visiting

Respondents were classified as having visited an eye-care professional “within one year”, “more than one year”, or “never” based on their answer to the question, “When was the last time you visited any eye-care professional?” The respondents who were classified in the last two categories were also asked the main reason for having not visited. The most cited reasons were “insurance/cost” and “no reason to go”. The other reasons were grouped as “others”.

Eye examination in the preceding 12 months

Respondents were classified as having had a dilated eye examination “within one year”, “more than one year”, or “never” based on their answer to the question “When was the last time you had an eye exam in which the pupils were dilated?”

Other covariates included respondents’ demographic (race, gender, marital status) and socioeconomic characteristics (income, education), general health status, and other chronic conditions (coronary heart disease, stroke, diabetes, obesity, activity limitation).

 

Statistical analysis

Statistical analyses were performed with SAS (version 9.1; SAS Institute Inc., Cary, NC, USA) and SUDAAN (version 9.0; Research Triangle Institute, Research Triangle Park, NC, USA) to account for the complex sampling design of BRFSS.

We combined eight states and compared their aggregate data with Florida. Wald chi-squared test was used to compare the differences between Florida and the eight other states on demographics, chronic conditions, age-related eye diseases, and eye care utilization. Multivariate logistic regression was used to examine the differences in the extent of visual impairment (distant and near) between Florida and other states controlling for demographic variables, chronic conditions, insurance, and eye examination.

Results

Of 62,750 participants for the vision module, 17,269 were aged 65 years and older. Among them, there were 3,261 Florida residents and 14,008 resided in the eight other states. Table 1 provides the comparison of demographic and health characteristics among respondents aged 65 years and older between Florida and the eight other states. There was no significant difference on the average of age and proportion of gender between the groups. Compared to their counterparts in the eight other states, the elderly residing in Florida had higher education level (beyond high school), income level (higher in $25,000–$50,000 category), more married people, and more Hispanic people. They also reported better health status (excellent/good: 74.1%) with lower prevalence of activities limit and obesity. Among the age-related eye diseases, the prevalence of cataract and glaucoma was higher in Florida. In contrast, the prevalence of age-related macular degeneration and diabetic retinopathy was comparable with the eight other states.

Table 1

Comparison of demographic and health characteristics of adults aged 65 years and older between Florida and eight other states*

Florida (N = 3261) Eight other states (N = 14,008) P value
% 95% CI % 95% CI
Age (mean) 74.6 74.6 0.41
Race <0.001
 White 78.2 76.2–80.1 80 78.6–81.3
 Black 6.3 5.3–7.6 8.6 7.6–9.6
 Hispanic 10.9 9.5–12.5 6.4 5.6–7.3
 Other 4.6 3.6–5.7 5.1 4.4–5.9
Sex 0.13
 Male 43.6 41.4–45.9 41.5 40.0–43.2
 Female 56.4 54.1–58.7 58.5 57.0–60.0
Education <0.001
 <High school 14.5 13.0–16.2 16.8 15.6–17.9
 High school 32.1 30.0–34.2 35.1 33.7–36.5
 >High school 53.4 51.5–55.6 47.5 46.0–49.0
Income 0.03
 <$25,000 29.9 27.9–32.0 33.0 31.6–34.4
 $25,000–<$50,000 26.9 24.9–28.9 23.8 22.6–25.1
 ≥$50,000 19.5 17.8–21.5 19.7 18.5–20.9
Marital status 0.007
 Married or partner 59.3 57.2–61.4 56.2 54.8–57.6
 Divorced, separated or widowed 37.7 35.7–39.8 39.6 38.2–41.0
 Never married 2.8 2.2–3.6 3.8 3.4–4.3
Age-related eye diseases
 Cataract 56.4 54.0–58.6 52.8 51.2–54.3 0.02
 Glaucoma 9.9 8.6–11.3 10.7 9.7–11.8 0.02
 Macular degeneration 8.9 7.7–10.4 8.6 7.7–9.5 0.56
 Diabetic retinopathy 3.1 2.4–4.1 3.7 3.1–4.2 0.57
Other chronic conditions
 Diabetes 18.3 16.6–20.1 20.1 19.0–21.3 0.20
 Stroke 8.1 7.0–9.4 8.2 7.5–9.1 0.61
 Cardiovascular disease 19.5 17.7–21.3 21.0 19.8–22.2 0.11
 Activities limit 29.5 27.5–31.6 31.9 30.5–33.4 0.02
 Obesity 18.5 16.8–20.3 20.8 19.6–22.0 0.01
Health status <0.001
 Excellent/Good 74.1 72.1–76.0 69.4 68.0–71.0
 Fair/Poor 25.3 23.4–27.2 29.7 28.3–31.1

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*Notes: Arizona, Connecticut, Georgia, New York, Nebraska, Ohio, Texas, and Tennessee.

Table 2 describes vision-related characteristics between Florida and the eight other states. Among respondents aged 65 years and older, fewer Floridians reported visually impaired in both distant and near vision compared to respondents in the other states. The percentage reporting “no difficulty” with distant vision was 84.1% vs 76.8% (P < 0.001). The percentage of “no difficulty” on near vision was 73.1% vs 63.0% (P < 0.001). More Floridians reported having an eye care visit (80.5% vs 74.8%, P < 0.001) and dilated eye examination (74.7% vs 64.0%, P < 0.001) within one year compared to the other states. The reasons for not having an eye care visit within the past 12 months did not differ between the comparison groups. The rate of health insurance with eye care coverage in Florida was higher (56.2% vs 50.4%) than that in the other states.

 

 

 

 

 

 

 

 

 

 

Table 2

Comparison of age-related eye diseases, visual impairment, eye care service utilization, and insurance of adults aged 65 years and older between Florida and eight other states*

Florida (N = 3261) Eight other states (N = 14,008) Pvalue
% 95% CI % 95% CI
Difficulty in recognizing a friend across the street (distant visual impairment) <0.001
 No difficulty 84.1 82.4–85.6 76.8 75.5–78.0
 Moderately difficult 9.8 8.5–11.2 13.0 12.0–14.1
 Extremely difficult 1.7 1.2–2.3 2.2 1.8–2.7
Difficulty in reading print in newspaper, receipt or numbers (near visual impairment) <0.001
 No difficulty 73.1 71.1–75.1 63.0 61.6–64.5
 Moderately difficult 19.5 17.7–21.3 25.3 24.0–26.7
 Extremely difficult 2.8 2.2–3.7 3.4 3.0–4.0
Last time of visiting eye doctor <0.001
 <12 months 80.5 78.5–82.3 74.8 73.4–76.1
 One or more years 19.0 17.2–20.9 24.2 22.9–25.6
 Never 0.6 0.2–1.4 0.2 0.1–0.3
Reasons for no eye care visits within the last 12 months 0.51
 Cost/insurance 11.5 8.4–15.6 12.6 10.6–14.8
 No reason to go 54.8 49.5–60.1 54.3 51.1–57.3
 Others 30.0 25.4–35.1 30.9 28.1–33.9
Last time of dilated eye examination <0.001
 <12 months 74.7 72.4–76.9 64.0 62.3–65.6
 One or more years 22.7 20.6–24.9 29.1 27.5–30.7
 Never 2.6 1.8–3.8 3.6 3.1–4.2
If having health insurance with eye care coverage 56.2 53.9–58.5 50.4 48.9–52.0 0.01

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*Notes: Arizona, Connecticut, Georgia, New York, Nebraska, Ohio, Texas, and Tennessee.

Because there existed the same pattern of association between health insurance coverage and eye care utilization, we combined the data from all nine states to examine the overall association. The results showed that people with health insurance covering eye care were associated with a higher percentage of eye care visit (82.9% vs 70.4%, P < 0.001) and dilated eye examination (75.4% vs 61.5%, P < 0.001) within a year.

The results from multivariate logistic regressions are showed in Table 4. Distant and near visual impairment were treated as different outcomes in the model. Residential setting was a strong predictor for both distant and near visual impairment, ie, elderly who lived in Florida were less likely to report distant (odds ratio [OR]: 0.68, 0.57–0.81) and near (OR: 0.66, 0.58–0.76) visual impairment. We further controlled for demographic variables including race, income, education and marital status, all of which had different distribution between the comparison groups, in Model 1. The adjusted odds ratio (AOR) did not change. Further controlling for health status in Model 2 and further controlling for health insurance, eye care visit and exam in Model 3 also had little influence on the AOR.

 

 

 

 

Table 4

Multivariate analysis for distant and near visual impairment: Florida versus eight other states

Florida Other states* P value
AOR (95% CI)
Distant visual impairment Model 11 0.68 (0.57–0.81) 1.00 <0.001
Model 22 0.69 (0.58–0.83) 1.00 <0.001
Model 33 0.61 (0.50–0.75) 1.00 <0.001
Near visual impairment Model 11 0.66 (0.58–0.76) 1.00 <0.001
Model 22 0.67 (0.58–0.77) 1.00 <0.001
Model 33 0.66 (0.57–0.77) 1.00 <0.001

*Notes: Arizona, Connecticut, Georgia, New York, Nebraska, Ohio, Texas, and Tennessee.

1Adjusted for race, income, education and marital status;

2Further adjusted for health status;

3Further adjusted for health insurance, eye care visit, and exam.

Abbreviations: AOR, adjusted odds ratio; CI, confidence interval.

Discussion

Our study showed Florida had larger proportion of senior population, and its prevalence of age-related eye diseases was comparable to or higher than the eight other states. However, Floridian elderly reported better distant and near visual function compared to their peers in the eight other states, even though all considered factors were accounted for. Some researchers had demonstrated that Florida’s elderly were in much better health than the elderly in other areas of the country: The age-sex-standardized mortality rate for whites aged 65–84 years in Florida was 10% below the US average in 1989–1991,10 and the elderly population had proportionally fewer elderly individuals require/eligible for nursing home admission.8 The results of current study provided additional evidence that Florida seniors also reported better visual function than the elderly in other regions.

Migration is defined as a change in one’s usual place of residence.18 Because Florida has long been the leading destination for elderly permanent migrants,19 the aging population in Florida increases mainly due to migration rather than from natural aging of Florida’s population.20 Smith and colleagues conducted a survey in Florida and demonstrated that higher income and education, higher proportion of married, better health status, and lower proportion of employment were associated with the higher probability of in-migration.18 Other researches also reported that Florida migrants were younger, had intact marriage,21 and lower stroke mortality rate.22 Although information on migration was not available in BRFSS, our results showed Floridian elderly had a better profile on the above variables. Our study sample may consist of more in-migrants, who are healthier, wealthier and better-educated. This could play a role contributing to a better visual function of Floridian seniors.

The nature of cross-section of our study leaves it open whether people with more severe eye disease tend to see health care providers more frequently or careful monitoring of eye health and regular eye examinations can help to detect and treat eye diseases in their early stage. However, we found that elderly Floridians had more frequent eye care visit and dilated eye exam while they reported better visual function. This resonates with a previous report that the elderly residents of Florida used more medical care.10 Many follow-up studies have found that the proportion with visual impairment was lower among people who used eye care services on a regular basis than those who had not, and recommended early screening among high risk population to prevent avoidable causes of vision loss.2325 Our results, along with those of previous studies, suggest that using more eye care may improve eye health condition.

The association between health insurance coverage and eye care utilization found in this study also helped to explain why Floridian seniors were motivated to use more eye care services. Floridian elderly had significantly higher insurance coverage than the other states. Moreover, nearly one third of Florida’s hospitals offer comprehensive geriatric assessment services and about a quarter are treating increasingly higher concentrations of Medicare patients.26 Abundant free advice on nutrition, health, and benefit claims are available in hospitals and senior centers.20 The state’s elderly friendly health care system and policies with a focus on health education and disease prevention in Florida induced more utilization of health care.

Aside from typical limitations such as the landline coverage bias, self-report data, and cross-section design that BRFSS may have, this study is subject to several additional ones. First, the vision module was only conducted in nine states in 2006, thus the comparison within these states may not be generalizable to all states in the US. Second, people with early stage of age-related eye diseases may not have an obvious symptom and thus may not have a clear professional diagnosis. Third, the question on retinopathy was asked among diabetic patients. The information of other types of retinopathy caused by such conditions as hypertension or central retinal vein occlusion was not available in this survey. Finally, refractive error had been identified as one of the leading causes of visual impairment in US.27 BRFSS did not ask about use of spectacles, thus we did not take refractive error into account for visual impairment. Better reported visual function in Florida may be attributed to higher rate of visual acuity correction.

In conclusion, although Florida has higher proportion of older adults and its prevalence of age-related eye diseases were comparable with or higher than the eight other states, Floridian elderly reported much better visual function. It may result from their better health, socioeconomic status, more utilization of eye care services, as well as migration to a state such as Florida where policies and services promote senior health. A better understanding of these factors is necessary for future development and implementation of effective health policies and intervention programs that address eye-care demands among an elderly population.

Table 3

The association of health insurance with eye care coverage and eye care service utilization among adults aged 65 years and older for nine states*

If having health insurance with eye care coverage
Yes % (95% CI) No% (95% CI) P value
Last time of eye doctor visit <0.001
 <12 months 82.9 (81.6–84.4) 70.4 (68.6–72.1)
 One or more years 17.0 (15.6–18.4) 29.1 (27.5–30.9)
 Never 0.1 (0.01–0.2) 0.5 (0.3–0.9)
 Total 1.00 1.00
Last time of dilated eye examination <0.001
 <12 months 75.6 (73.8–77.4) 61.7 (59.6–63.7)
 One or more years 21.9 (20.2–23.7) 34.2 (32.2–36.3)
 Never 2.5 (2.0–3.1) 4.1 (3.4–5.0)
 Total 1.00 1.00

*Notes: Arizona, Florida, Connecticut, Georgia, New York, Nebraska, Ohio, Texas, and Tennessee.

**95%, confidence interval.

Footnotes

Disclosures

The findings and conclusions in this report are those of the author(s) and do not necessarily represent the official position of the Centers for Disease Control and Prevention. The authors report no conflicts of interest in this work.

References

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