There are 66 per cent more Americans suffering from myopia (short-sightedness) in the US today than there were in the 1970s, according to a study by the National Eye Institute.
Researchers say that kids need to get out more as activities such as texting and surfing the internet are taking their toll on the nation"s eyes, reports Bloomberg.
In a recent survey, 44 per cent of American suffered from myopia, compared to 25 per cent in research carried out in 1971 and 1972.
This costs $3.8 billion (£2.3 billion) a year a figure which stands to rise by $1 billion for every 12 per cent increase in the prevalence of myopia.
Lead author of the study, Susan Vitale, said that the leading cause of this was the fact that more people are spending time indoors doing activities which involve close-up viewing rather than spending time pursuing outdoor interests.
Sight charity Eyecare Trust, along with Simplyhealth, recently stated that fruit and vegetables are important for good eye health, warning that obesity makes people twice as likely to lose their sight as those with a normal body mass index.
by Martin Burns