Why do so many people need glasses? Like how did we manage for millennia without them?

Question

Ok I get we all look at small letters and images on screens and paper these days. Is this why in the last 150 years or so millions and millions of humans need spectacles? Is it because we are meant to be looking at things from a distance rather than nearby so our eyes haven’t caught up?

In: Biology

Answer 1

There’s a fair amount of evidence that bright light during infancy and childhood reduces the possibility of myopia (near sightedness), so the fact we have gone from living outdoors on the plains of Africa to living mostly indoors may have some effect, but it’s still not clear how large of an effect this actually is