Children who have years in the summer summer, especially those who spend many hours playing with smartphones and tablets may have and the highest risk of visual problems, suggests a new study.
The myopia is on the rise all over the world. This is what physicians call a refractive error, which means that the eyes can not properly focus the light. Result: Nearby objects are clear and distant objects are blurred.
This is most often provoked by a constant focus on nearby objects, while the eyes are still under development, for example when reading. However, the growing use of electronic devices seems to cause a worsening of the problem, researchers said.
"As always, everything should be done by moderation," said lead researcher Dr. Christopher Hammond, professor of ophthalmology at King's College in London, England. He urged parents to restrict the use of electronic devices by children.
This seems particularly important for children who Born in the summer, says the study. This is because they begin to formally form at a younger age than children born in the winter, so they are exposed to reading earlier. And this increases the risk of myopia, said the researchers.
They added that although their studies do not prove it smartphones, tablets and computer games cause myopia, they can lead children to spend less time outdoors. And spending less time outside also seems to increase the risk of myopia.
"We know that time spent outdoors is protective, so kids would probably spend up to two hours a day outdoors," Hammond said.
The myopia It can be repaired through glass, laser surgery or contact lenses. But at a later age, those with short-sightedness are more likely to develop conditions that end up in surveillance, such as cataracts or glaucoma, scientists have warned.
Experts predicted that by 2050 nearly 5 billion people worldwide will have short-sightedness. This is compared to approximately 2 billion in 2010.
Genes are associated with the risk of a human condition, but even if it has a genetic component, it does not explain a dramatic increase, Hammond said.
In his study, his team collected data on nearly 2000 twins born in the United Kingdom between 1994 and 1996.
Researchers evaluated the results of eye tests as well as data on social, economic, educational and behavioral properties of twins aged between 2 and 16 years. Parents and teachers also completed questionnaires.
On average, children at the age of 11 began to use eyeglasses for myopia. About 5 percent had amblyopia ("lazy eye") and about 5 percent had strabismus. A total of 26% of the twins were myopic, a study showed.
Children whose mothers attended the university, children born in the months summer and those who spent more time using electronic devices were more likely myopia, found a study.
The findings were published in the on-line British Journal of Ophthalmology on November 6.
Dr. Tien Wong, medical director of Singapore's National Eye Center, co-authored the publication with the study.
"Evidence supports the link between time spent before screen devices and myopia, and that includes time spent on phones and tablets," he said.
This is worrying about the number of small children who have access to these devices, Wong added. Evidence shows that 2-year-olds spend up to two hours a day using digital devices.
"Managing the time your child spends in front of the screens and increasing their outdoor play will help reduce the risk of myopia," Wong said. "We must better monitor our children's activities with facilities, even at pre-school age."
Surprisingly, researchers said children born as a result of fertility treatment had a 25-30% lower risk of myopia. They said this may be due to the fact that many are born prematurely and have a developmental delay, which could explain shorter eye lengths and fewer cases myopia,