For comparison, another group of nine volunteers with amblyopia wore similar goggles but had their good eye covered, and watched the whole game through only their lazy eye.
He said his research and other studies suggest amblyopia is actually a two-eye problem and that patching the good eye may hinder rather than help the weak one.
Nine volunteers with amblyopia were asked to wear the goggles for an hour a day over the next two weeks while playing Tetris, the falling building block video game.