However, Dr Susan Blakeney, clinical adviser to the College of Optometrists, says there could be other factors contributing to why our increasingly indoor lifestyles may be causing bad eyesight.
'We still don't know what it is about time spent outside that has a protective effect against short-sightedness - it could be the sunshine, the brightness of the light or the fact that objects you focus on tend to be farther away outdoors.'
In rare cases short-sightedness can also be caused by the curve of the cornea (the transparent part of the front of the eyeball) being too steep.
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