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The eyesight of children under six could be harmed by 3D games played on Nintendo's forthcoming handheld console, the company has warned.
The games giant posted the information on its website devoted to the 3DS handheld.
It said specialists had warned of possible damage that could be caused by 3D games which present different images to the right and left eyes.
Younger children should only play 2D versions of 3DS games, Nintendo said.