The McGill University team discovered the popular tile-matching puzzle could train both eyes to work together.
In a small study, in Current Biology with 18 adults, it worked better than conventional patching of the good eye to make the weak one work harder.
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.
The goggles allowed one eye to see only the falling objects, while the other eye could see only the blocks that accumulate on the ground in the game.
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.
At the end of the two weeks, the group who used both eyes had more improvement in their vision than the patched group.
The researchers then let the patched group have a go at using the goggles with both eyes uncovered. Their vision then improved significantly.
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