Relationship of Self-reported and Performance-based Visual Function With Performance-based Measures of Physical Function: The Health ABC Study

Abstract

AbstractBackgroundTo assess the relationship between self-reported and performance-based visual impairment (VI) and lower extremity physical function.MethodsCross-sectional analysis of 2 219 Health ABC participants who completed vision testing and the Short Physical Performance Battery (SPPB). Linear regression models used either self-reported (weighted visual function question [VFQ] score) or performance-based (visual acuity [VA], log contrast sensitivity [LCS], Frisby stereoacuity [SA]) to predict SPPB or its components—gait speed, chair stands, or standing balance—with and without covariate adjustment.ResultsMean age was 73.5 years (range 69–80); 52.4% were female and 37.4% African American. All VI measures were strongly associated with SPPB in unadjusted and adjusted models (p < .001). A self-reported VFQ score 1 standard deviation lower than the mean (mean 87.8 out of 100) demonstrated a −0.241 (95% confidence interval [CI]: −0.325, −0.156) adjusted difference in SPPB. After controlling for covariates, VA of <20/40 (41%) demonstrated a −0.496 (−0.660, −0.331) lower SPPB score while SA score>85 arcsec (30%) had a −0.449 (−0.627, −0.271) adjusted SPPB score versus those with better visual function. LCS < 1.55 (28.6%) was associated with a −0.759 (−0.938, −0.579) lower and LCS ≤ 1.30 (8%) with a −1.216 (−1.515, −0.918) lower adjusted SPPB score relative to better LCS. In a final multivariable model containing multiple vision measures, LCS remained independently associated with SPPB and all components, while SA remained associated with balance (all p < .05).ConclusionsBoth self-reported and performance-based VI are strongly associated with poor lower extremity physical function. These findings may identify a subgroup of older adults with co-existing visual and physical dysfunction who may benefit from targeted screening and intervention to prevent disability.