University of Edinburgh researchers have reported that a higher level of cognitive function is linked with wearing spectacles.
The research, which was published in Nature Communications, identified 148 independent genetic loci influencing general cognitive function.
As well as a range of health variables, including longevity and hypertension, the scientists found that whether or not a person wears spectacles is connected to their mental agility.
They conclude that a spectacle-wearer is 28% more likely to be intelligent than a person who does not require visual correction.
The study examined data from 300,486 individuals between the ages of 16 and 102 taken from Cohorts for Heart and Aging Research in Genomic Epidemiology, the Cognitive Genomics Consortium and UK Biobank.