3D movies a pain in the head

Movie buffs and sports fans looking to 3D televisions for the ultimate home theater experience may want to get their eyes checked first or risk a 3D headache, US eye experts have said.

The growing popularity of three-dimensional movies, such as James Cameron's Avatar, has inspired a crop of 3D TV sets, unveiled this week at the International Consumer Electronics Show in Las Vegas.

And while new digital 3D technology has made the experience more comfortable for many, for some people with eye problems, a prolonged 3D session may result in an aching head, they said.