April 2014
Volume 55, Issue 13
Free
ARVO Annual Meeting Abstract  |   April 2014
Visual Acuity and Increased Mortality: The Role of Allostatic Load and Functional Status
Author Affiliations & Notes
  • Dandan Diane Zheng
    Epidemiology & Public Health, University of Miami, Miami, FL
  • Sharon L Christ
    Department of Human Development and Family Studies, Purdue University, West Lafayette, IN
  • Byron L Lam
    Bascom Palmer Eye Institute, University of Miami, Miami, FL
  • Stacey Tannenbaum
    Epidemiology & Public Health, University of Miami, Miami, FL
  • David J Lee
    Epidemiology & Public Health, University of Miami, Miami, FL
  • Footnotes
    Commercial Relationships Dandan Zheng, None; Sharon Christ, None; Byron Lam, None; Stacey Tannenbaum, None; David Lee, None
  • Footnotes
    Support None
Investigative Ophthalmology & Visual Science April 2014, Vol.55, 2683. doi:
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      Dandan Diane Zheng, Sharon L Christ, Byron L Lam, Stacey Tannenbaum, David J Lee, ; Visual Acuity and Increased Mortality: The Role of Allostatic Load and Functional Status. Invest. Ophthalmol. Vis. Sci. 2014;55(13):2683.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract
 
Purpose
 

Poor vision can have a detrimental impact on functional status and may have an effect on allostatic load (AL). AL is a measure of the cumulative physiological wear and tear on the body's regulatory systems. In the present study, we examined the relationship between vision, functional status, allostatic load, and mortality by estimating the direct and indirect effects of visual acuity (VA) on mortality through functional status and allostatic load in older adults.

 
Methods
 

Data from 4,981 adult participants (> age 60 years) of the 1999-2004 National Health and Nutrition Examination Survey (NHANES) with mortality linkage through 2006 were analyzed. Functional status was assessed by Activities of Daily Living (ADL) and Instrumental Activities of Daily Living (IADL). The AL index is comprised of 10 biomarkers and anthropometric measures based on the scientific literature. VA was treated as a four category ordinal variable with categories no VI, mild VI, moderate VI, and severe VI. Structural equation modeling was employed using three mediating variables representing ADL, IADL and AL to examine the effects of VA on all-cause mortality (Model depicted in Figure).

 
Results
 

VA increases the risk of mortality directly after adjusting for ADL, IADL, AL and other covariates. A one unit change in VA category increased the risk of mortality by 1.17; 95% CI: [1.05, 1.32]. IADL and AL both predict mortality (HR=1.15 [1.10, 1.20] and HR=1.13 [1.06, 1.20] respectively). ADL did not predict mortality after controlling for IADL, AL and other covariates (HR=0.98 [0.91, 1.05]). Worse VA was associated with increased AL (b= 0.11; p=0.013) and worse IADL (b=1.06; p<0.001). VA increases mortality risk indirectly through IADL (HR= 1.07 [1.03, 1.12]) and AL (HR=1.11; [1.06, 1.17]). The total effect of VI on mortality including its influence through IADL and AL is HR 1.27 [1.12, 1.44].

 
Conclusions
 

Visual impairment directly increases the risk of mortality and may indirectly increase mortality risk slightly through its adverse impact on functioning status IADL and on Allostatic Load.

  
Keywords: 754 visual acuity • 413 aging  
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