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What is the relationship between visual impairment and cognitive function in octogenarians?
- Source :
-
The New Zealand medical journal [N Z Med J] 2017 Aug 11; Vol. 130 (1460), pp. 33-47. Date of Electronic Publication: 2017 Aug 11. - Publication Year :
- 2017
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Abstract
- Aims: To examine direct and indirect pathways between visual and cognitive function in advanced age.<br />Methods: We analysed cross-sectional baseline data from Life and Living in Advanced Age: A Cohort Study in New Zealand, which recruited equal sample sizes of Māori (n=421) and non-Māori (n=516) octogenarians. The Modified Mini-Mental State Examination assessed cognitive function. Vision was assessed with self-report and measured distance visual acuity. Associations between visual and cognitive function were explored using general linear models and structural equation modelling.<br />Results: Both Māori (mean age 82) and non-Māori (mean age 85) had good visual acuity [Māori: mean (standard deviation) 0.18 (0.20) logMAR; non-Māori 0.20 (0.17) logMAR] and cognitive function scores [Māori: median (interquartile range) 3MS=90 (11), non-Māori: 94 (8)]. Self-reported visual impairment was present almost 25% of the sample. Adjusting for confounders, no direct association was found between visual and cognitive function. For non-Māori, the path diagram showed the association between vision loss, and cognitive function was mediated by functional status.<br />Conclusion: Findings indicate that cognitive function is a multifactorial entity; rather than a direct effect of vision loss, mediating factors appear to contribute to cognitive decline in advanced age.<br />Competing Interests: Nil.
Details
- Language :
- English
- ISSN :
- 1175-8716
- Volume :
- 130
- Issue :
- 1460
- Database :
- MEDLINE
- Journal :
- The New Zealand medical journal
- Publication Type :
- Academic Journal
- Accession number :
- 28796770