Are 3-D movies bad for your eyes?

Three-dimensional effects are predicted to be popular box-office attractions this summer.No fewer than 15 mainstream films -- including Disney/Pixar's animated "Up" and director James Cameron's motion-capture "Avatar" -- will be available in 3-D this year. But will movies that seem to pop out of the screen hurt your eyes?Some vision researchers say yes. They argue that repeatedly asking our eyes and brains to go against their normal function has short-term effects. And they worry about the long-term effect on small children whose vision systems are still in development....

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