"We will recommend that very young children not look at 3D images," he said. "That's because, [in] young children, the muscles for the eyes are not fully formed... This is the same messaging that the industry is putting out with 3D movies, so it is a standard protocol. We have the same type of messaging for the [1990s Nintendo virtual reality machine] Virtual Boy, as an example."

Fils-Aime said that "young children" cut-off edge would be around seven. Kids are certainly a relevant portion of Nintendo's audience, eager consumers of games like Pokemon and Nintendogs, the latter of which will see a sequel called Nintendogs + Cats on the 3DS. A slider on the 3DS allows a user to decrease and eventually shut off the machine's 3D display, flattening the game graphics to the more conventional flat look.