The increase in the number of people with poor vision across the planet is probably due to the fact that people are spending less time outdoors, one expert has theorised.
According to Dr Sandra Aamodt, a neuroscientist and author, speaking to NPR.org, the prevalence of nearsightedness could be down to the amount of time people are spending indoors, in front of monitors and TV screens with artificial light surrounding them.
This in turn means the number of people requiring vision correction products such as glasses or contact lenses is increasing, the expert explained.
She added that, because the pupils get smaller when people are outside, they can focus on more things at once in the same way a camera does.
"That might give a stronger signal to your retina about when the image is in focus. The distance to the retina needs to be maintained correctly for the strength of the lens," she explained.
One way to correct nearsightedness may be to use contact lenses, according to basketball player Olivia DeFrancesco, who recently told the Winston-Salem Journal that her on-court form has improved greatly since she switched to contacts.
by Alexa Kaczka