SEATTLE – One problem with Nintendo's much ballyhooed 3DS gaming system is giving the company a real headache.
That problem is game players getting headaches, literally, from watching the 3-D screen for too long, especially children.
The system, which does not require special glasses to see the 3-D effect, went on sale in the U.S. Monday.
Nintendo doesn't make any secret of the headache problem. The system reminds the user to take a break after every 30 minutes of game play. There is also a warning that only children age seven and older should use the 3-D feature, and that children six and under may suffer vision damage by watching 3-D images.
"Kids' eyes are still developing at this age. They say it takes until the age of six or seven to get the idea of being in this 3-D world, " technology expert Daniel Sieberg said.
Nintendo notes that the 3-D effect is adjustable (and can be turned off completely, too), which could help those prone to headaches from 3-D.
But whether the problem will hurt 3DS sales remains to be seen. Commenters on several tech blogs and Twitter have said they do not like the feature.
The Associated Press contributed to this report.