Outdoor Time May Reduce Nearsightedness in
MONDAY, Oct. 24 (HealthDay News) -- Myopia, or nearsightedness,
is much more common among children and teenagers today than it was
about 40 years ago, but spending more time outside could help
reverse this trend, a new study suggests.
The authors argued that increased exposure to natural light and
more time spent looking at objects from afar might protect kids'
British researchers analyzed data from eight previous studies on
outdoor time in 10,400 children and teens with myopia. For every
hour spent outside each week, the odds that a child would develop
myopia dropped by about 2 percent.
The finding are slated for presentation Monday at the annual
meeting of the American Academy of Ophthalmology, held in Orlando,
In the study, nearsighted children spent nearly four hours less
time outside weekly, on average, than other kids with normal vision
or farsightedness. The protective effect is linked to just being
outside, not engaging in specific activities, the researchers said
in an academy news release.
They added that more research is needed to determine if there is
also a link between "near work" such as playing computer games or
studying and the increase in myopia among kids. Whether increasing
the amount of time kids with myopia spend outside will prevent
their nearsightedness from getting worse is another topic for
consideration, the researchers said.
"Increasing children's outdoor time could be a simple and cost-effective measure, with important benefits for their vision and general health," study author Dr. Anthony Khawaja, of the University of Cambridge, said in the release. "If we want to make clear recommendations, however, we'll need more precise data. Future, prospective studies will help us understand which factors, such as increased use of distance vision, reduced use of near vision, natural ultraviolet light exposure or physical activity, are most important."
Because this study was presented at a medical meeting, the data
and conclusions should be viewed as preliminary until published in
a peer-reviewed journal.
The U.S. National Institutes of Health provides more information
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