Kids aren’t spending enough time outside. It’s fueling an epidemic of nearsightedness.
Nearsightedness develops in childhood, typically between ages 5 and 16, and it’s closely linked to a lack of exposure to sunlight. Eye doctors say more kids are developing the condition and at earlier ages. Half the global population is expected to be nearsighted by 2050, up from 30% now, according to the World Health Organization.
Sure, kids choosing screens over outdoor fun is a long-running—potentially overplayed—theme. And as annoying as it is to parents, it’s been hard to quantify the damage. In the case of eyesight, however, the research is clear. Our vision is getting worse because of our relationship with our devices.
While there’s no consensus on how much time kids spend outside, doctors like to cite one stat, from a 2015 University of Michigan study: Kids spent just seven minutes a day in unstructured outdoor play time. If anything, that figure has shrunk in recent years.
Schools and child-care centers still have recess, and many kids play outdoor sports, so they’re likely getting more outdoor time than that. But they aren’t wandering the streets or riding bikes like they did in past decades.
People with myopia, the condition’s formal name, have a hard time seeing things clearly in the distance. It’s referred to as nearsightedness or shortsightedness because people can see things up close more easily. When eyes don’t get enough natural light, they grow longer, say researchers. The longer shape makes it harder to focus, so objects in the distance appear blurry.