The number of people affected with farsightedness or difficulty seeing objects due to their age is believed to be in excess of one billion, according to a recent study.
Presbyopia is the proper term for adults who, due to their advancing age, have trouble seeing objects nearby.
According to a recent report in the Archives of Ophthalmology, more than a billion people across the globe are presbyopic.
Presbyopia can be corrected with glasses or contact lenses, but the study - conducted by scientists at the University of New South Wales, Australia - found that around 517 million of the people with this condition were not using any type of vision correction methods.
The team of researchers used census data and other surveys to make these estimates.
"As more data become available, an increasingly accurate picture of the burden of presbyopia will emerge," the authors wrote.
Those who are concerned about age-related eyesight difficulties could consider visiting an optician for an eye test. This can determine whether any glasses or contact lenses are necessary.
by Emily Tait