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It may
seem merely a cliche born of centuries of educated people straining their eyes
in dimly-lit libraries, but new genetic research suggests those who wear
glasses really are more intelligent.
Researchers
at the University of Edinburgh analysed the genetic data of more than 44,480
people.
They
found that, overall, those who were more intelligent were nearly 30 per cent
more likely to have genes indicating they require reading glasses than those
who scored poorly.
Published
in the journal Nature Communications, the research also linked higher cognitive
ability to genes known to play a part in better cardiovascular health.
The
results are based on the most thorough investigation of intelligence genes of
its kind to date.
The
research team examined 148 genomic regions related to better cognitive
function, including 58 that have not previously been reported.
They said
the results could help understanding of the declines in cognitive function that
happen with illness and as people age.
Because
of the study’s design it is not possible to say why there is a genetic
correlation between intelligence, poor eyesight and cardiovascular health.
However,
Dr Gail Davies, of University of Edinburgh's Centre for Cognitive Ageing and
Cognitive Epidemiology, who led the analysis, said:
"This
study, the largest genetic study of cognitive function, has identified many
genetic differences that contribute to the heritability of thinking skills.
"The
discovery of shared genetic effects on health outcomes and brain structure
provides a foundation for exploring the mechanisms by which these differences
influence thinking skills throughout a lifetime."
Those who
participated in the study had all taken a variety of thinking tests which were
summarised as a general cognitive ability score.
All had genetic testing that
examined their DNA and none of the people had dementia or a stroke.
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