Association between visual status and the frequency of laughter in older Japanese individuals: the JAGES cross-sectional study.

Objective: Although the beneficial effects of laughter are abundantly reported, the physical function that is required as a premise for laughter has not been studied. The aim of this study is to investigate the association between visual status and frequency of laughter in a population-based sample of older adults. Methods and analysis: We analysed cross-sectional data of community-dwelling independent individuals aged ≥65 years (n=19 452) in Japan. The outcomes were frequency of laughter and number of opportunities to laugh. We used multivariable logistic regression analysis with multiple imputations to investigate the association between visual status and laughter. Results: The number of participants who laughed almost every day was 8197 (42.1%). After adjusting for individual covariates in the multivariable logistic regression analysis with multiple imputations, visual status was found to be significantly associated with the frequency of laugher and the number of opportunities to laugh (p for trend <0.01). Compare to 'normal vision', while excellent/very good vision was associated with increased frequency and number of opportunities to laugh (ORs: 1.72 and 1.25, respectively), poor vision decreased the frequency and number of opportunities to laugh (ORs: 0.86 and 0.87, respectively). Conclusions: There is a link between visual impairment and laughter, with poor vision having a negative impact while good vision has a positive effect. Improving vision may lead to laughter promotion.