Children who spend more time outdoors are less likely to develop short-sightedness.
Australian eye researchers at the University of Sydney have discovered that environmental factors like close-reading and intensive study can lead to short-sightedness, or myopia.
But playing outdoors can help protect children from this affect.
Researchers say sunlight's believed to cut myopia by encouraging the release of a brain chemical which stops excessive eye growth.
They say being outdoors is the key, no-matter what activity children are doing.
But interestingly, they also found that watching TV and using computers has little effect on the development of short-sightedness.