Quite interesting information. Also inbefore "3D heals your eyes!".
http://www.cbc.ca/health/story/2010/12/29/gaming-3ds-children-eyes-nintendo.html
http://www.cbc.ca/health/story/2010/12/29/gaming-3ds-children-eyes-nintendo.html
In May, Nintendo CEO Satoru Iwata told the Associated Press that health concerns related to "children's eyesight" were a key factor in the decision to make a 2D mode available on the 3DS.
For older players, the company's advisory suggests taking a break after 30 minutes of playing in 3D mode.
Sony recommends consulting a doctor before allowing young children to watch 3D video images or play 3D games.
In April, television manufacturer Samsung Electronics Canada issued a warning to children and pregnant women to be careful if they start to feel dizzy when watching its 3D television.