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This is Scientific Americans' 60-second science. I'm Steve Merski. Got a minute?

So we're inside, we're in fake lighting, we're not spending as much time outside in the context which our visual system evolved.

Amanda Maline, assistant professor of anthropology and archaeology and of medical genetics at the University of Calgary.

And all that sitting inside in dim light

staring at screens has led to an epidemic of myopia, near-sightedness among young people.

The myopia epidemic is particularly strong in Asia and in urban Asian environments,

where it is increasing to be upwards of 90% of teenagers are myopes.

Maline spoke February 20th at a press briefing at the annual meeting of the American Association for the Advancement of Science in Boston.

So to be sure there's a genetic component, my father had glasses, I have glasses,

but we're increasingly realizing that the environments in which we're spending our time are playing a major role.

And so a cohort study where some school-aged children were given 40 minutes or more time outside,

those children had a 23 to 50% less likely chance of developing myopia than students at schools who were not given

that same amount of outdoor exposure, and it looks to be dosage dependent. So the longer time you

spend outside, the less chance you have of developing myopia. So the exact mechanisms are not

really known, so we really need a lot more research into this, but another major factor

that's being implicated is near work activities. So spending our times looking at computers,

into microscopes, these things. And then as soon as we leave our work, what are we doing? We're on

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