As somebody who only recently started wearing glasses only sometimes, I shouldn’t really celebrate this, but – The Guardian has Scottish research that shows a genetic link between poor eyesight and high intelligence:
In the study, the largest of its kind ever conducted, researchers from the University of Edinburgh analyzed cognitive and genetic data from over 300,000 people aged between 16 and 102 that had been gathered by the UK Biobank and the Charge and Cogent consortia. Their analysis found “significant genetic overlap between general cognitive function, reaction time, and many health variables including eyesight, hypertension, and longevity”. Specifically, people who were more intelligent were almost 30% more likely to have genes which might indicate they’d need to wear glasses.
While being more intelligent may be linked to poor eyesight, it’s also connected with a lot of positive health benefits. Researchers found negative correlations between cognitive function and a number of health problems, including angina, lung cancer and depression.
Of course, it’s important to remember that these are all simply correlations not conclusive links.
[W]earing glasses, whether you need them or not, makes people think you are more intelligent. A number of studies have found people who wear glasses are perceived as smarter, more dependable, industrious and honest. Which is why a lot of defense lawyers get their clients to wear glasses at trial. As lawyer Harvey Slovis explained to New York magazine: “Glasses soften their appearance so that they don’t look capable of committing a crime. I’ve tried cases where there’s been a tremendous amount of evidence, but my client wore glasses and got acquitted. The glasses create a kind of unspoken nerd defense.”