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Reggie Fils-Aime, the president of Nintendo of America, says the company is “aware of all the work that has been done in the field” and issued the warning based on that work. The warning, he said, is based on research that up until age 6, a child’s eye _ specifically the connection between the eye and the brain _ is still developing.

Nintendo, he said, wants to be “conservative and consistent,” erring on the side of safety.

Optometrists haven’t seen any sign that 3-D screens can cause lasting damage, but they also acknowledge that not much is known about how 3-D viewing affects us. Hunter, the ophthalmologist, agrees.

The optometrists' association announced this week that it has formed an alliance with the 3DAtHome Consortium, a group of TV manufacturers and Hollywood studios promoting the technology. The idea is that the two groups will share information about the effects of 3-D. In the future, Duenas said, 3-D movies might be preceded by public service announcements recommending vision examinations for those who have problems perceiving the 3-D effect.

Dr. Jim Sheedy, director of the Vision Performance Institute at Pacific University in Forest Grove, Ore., said parents should limit kids’ use of the 3DS just as they limit computer or game console use.

“Is there a limit on how much a child should be viewing 3-D? Yeah. How much is it? I don’t know. Let’s use some sound judgment,” he said.

He noted that the No. 1 health issue associated with console and computer gaming is obesity, rather than eye problems.

“Kids should be out running around,” he said.

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AP Technology Writer Barbara Ortutay contributed to this report.

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Online:

American Optometric Association’s 3-D page: http://www.3deyehealth.org