Thursday, June 6, 2013

More Time Outdoors may Reduce Kids' Risk of Nearsightedness (#sponsored post)

Disclosure: The American Academy of Ophthalmology provided me with the information for this sponsored post, and they wrote the article.

More Time Outdoors May Reduce Kids' Risk of Nearsightedness

Encouraging children to spend more time outdoors may be a simple way to improve their vision as well as general health, according to several recent studies. The new research adds to growing evidence that spending time outdoors may lower the risk of nearsightedness in children and teens. Nearsightedness is much more common today in the United States and many other countries than it was in the 1970s.  
One of the new studies showed that for each additional hour children spent outdoors per week, their risk of being nearsighted dropped by about two percent. Children who were nearsighted spent on average 3.7 fewer hours per week outdoors than those who either had normal vision or were farsighted. The study investigated whether children who logged more outdoor time also spent less time performing near work, such as playing computer games or studying, but no such relationship was found.
A second study found that when schoolchildren were required to spend 80 minutes of recess time outdoors every day, fewer of them became nearsighted when compared to children who did not spend recess outdoors.

A third study, in Danish children, was the first to show that the rate of eye growth varies in relation to exposure to daylight. This is important, because if the eye grows too long, as measured from front to back, the child will become nearsighted. The study found that the children’s eye grew normally during the long days of summer in Denmark, but grew too fast during the short days of winter.
Though researchers don’t yet know exactly why outdoor time is beneficial, they think it’s probably related to exposure to daylight rather than to playing sports or other specific activities.
Future research is planned to learn more about how time outdoors supports healthy vision. Questions include whether time spent on near work should be limited, and whether there are factors—like parents' attitudes, access to safe playgrounds, or others—that may result in nearsighted children spending less time outdoors. More research is also needed to explain how much of the outdoor time benefit comes from daylight exposure and how much from exercising distance vision, since both may be keys to preventing nearsightedness.

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