British researchers say too much staring at the screen is harming the vision of kids and young adults.
They say they've seen a 35 percent increase in near-sightedness since the launch of smartphones in 1997.
They've even come up with a new name for it "screen-sightedness".
Doctors say most people hold their phones about eight inches away from the face.
Now compare that to where you hold a book or magazine, which is about 16 inches away.