Only months before the 3DS launches in Japan and the U.S., Nintendo is now warning customers on its Japanese site that children under 6 years old shouldn't use the 3-D console
, because it might damage the development of their eyes. The 3DS, which features 3-D gameplay without glasses, will have the option to lock into 2-D mode so younger kids can safely play, according to Engadget. While overprotective parents will still freak out, it's important to note that there aren't yet any credible studies of modern 3-D technology that could prove Nintendo's concerns hold water. Of course, with the proliferation of 3-D TVs and games, these studies will come. But Dr. Michael Ehrenhaus, a New York ophthalmologist, told FOX News that Nintendo's current disclaimer could be premature
. "I don't foresee it as a major issue, they're just being overly concerned," he said of the warning. Nintendo also warned adults that they should use the 3DS for just 30 minutes at a time, since eye fatigue occurs faster when you're looking at 3-D images than at 2-D ones.