Other factors, such as computer games and the level of mother's education, seem to affect this disease, which is expected to affect 4.758 million people worldwide by 2050. This was demonstrated by this study, which was used in twins.
Myopia was consensually explained by hereditary factors.
Born in the summer months and hours for computer games, it is associated with a greater risk of short or short-sightedness (myopia) in childhood, according to a twin study published in the digital edition of "British Journal of Ophthalmology"But fertility treatment can be safe, findings show. (Read: Common Cold Infectious Diseases)
Myopia is defined as a refractive error, which means that the eye can not properly focus on the light, which makes the nearby objects clear, but the remote objects are blurred. And this is a more and more common disease: it is likely that 4,758 million people worldwide will be affected in 2050, compared with 1,950 million in 2010.
This can be done with glasses, laser surgery or contact lenses, but the condition is associated with a higher risk of visual impairment and loss of vision in later life.
They believe that genes play a role in the disorder, but do not fully explain the rising prevalence. Given the rapid development of eyes in early life, researchers wanted to explore the potential impacts of environmental factors throughout their lives.
These experts studied 1991 twins, whose age was on average 16.7 years. All were born between 1994 and 1996 in the United Kingdom and participated in "An early development study on the long-term Twins family " (TEDS, for its acronym in English).
The opticians provided information about their eye examinations on the myopia, and the researchers analyzed demographic, social, economic, educational and behavioral factors in twins when these children had 2, 3, 4, 7, 8, 10, 12, 14 and 16 years to capture critical levels of development of children and eyes.
Parents and teachers filled in comprehensive questionnaires and twins made an online assessment in order to provide a wide range of potentially relevant information and background factors that could influence the development of early life.
The average age at which children with myopia began to wear spectacles in order to repair the condition was 11 years. Approximately 1 in 20 (5.4 percent) had "lazy eye" (amblyopia) and a similar proportion (almost 4.5 percent) had strabismus. In general, one in four (26 per cent) twins was short-sighted.
Factors that were at worst times associated with the development of short-sightedness at different time points were the educational successes of the mother (university or postgraduate level), hours dedicated to computer games and birth in the summer. The time spent on playing computer games may not only be related to close work, but also with less time outdoors, a factor that was previously associated with a higher risk of bronchus.
The educational achievement was also associated with the nipple, and as a child in the United Kingdom, born in the summer months, it will start a school at a younger age than those born in the winter months, scientists suggest that this close work could accelerate the growth of the eye, which responsible for myopia.
Less myopia in children born after fertility treatment
A higher level of household income and intelligence, in particular the results of verbal skills, were associated with a higher risk, but to a lesser extent. Fertility treatment seemed to provide protection against a peaceful illness and is associated with a 25-30% lower risk.
Researchers, members Department of Academic Ophthalmology "King's College London"in London, the United Kingdom speculates that children born as a result of fertility treatment are often born smaller and slightly more premature and may have a certain degree of developmental delay, which could explain shorter eye lengths and fewer bronchi.
However, this is an observational study and, as such, can not establish the cause, researchers say, while researching that future research can analyze the interaction between genetic susceptibility and environmental impacts.