3D video puts a strain on kids' vision

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3-D video is a big hit now for video games (WPVI)

3-D video is a big hit now for video games.

But many have warning stickers that they can strain young children'sstill-developing vision.

It's because the pictures are made using 2 off-set images with slight differences to them.

"That causes a problem for your eyes, because your eyes are used to focusing in a certain way and then your brain processes that information to tell where the distance is for the image," says Dr. Allison Babiuch, a pediatric ophthalmologist at the Cleveland Clinic.

Doctors say the closer you sit to the screen, the higher the chance of vision problems, such as headaches and fatigue.

So don't let the kids sit too close, or play them all day long.
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