A French health watchdog has recommended that children under the age of six should not be allowed access to 3D content.
The Agency for Food, Environmental and Occupational Health and Safety (Anses) added that access for those up to the age of 13 should be "moderate".
It follows research into the possible impact of 3D imaging on still-developing eyes.
Few countries currently have guidelines about 3D usage.
According to Anses, the process of assimilating a three-dimensional effect requires the eyes to look at images in two different places at the same time before the brain translates it as one image.
"In children, and particularly before the age of six, the health effects of this vergence-accommodation conflict could be much more severe given the active development of the visual system at this time," it said in a statement.
