A study of lazy eyes in kittens found that putting the animals in complete darkness seemed to cure their condition. "When I say dark, I mean really dark," said the study's co-author Kevin Duffy. "There are zero photons of light. It's not like going and closing your windows or drapes." The findings, published in Current Biology, could translate into a treatment for millions of people who have amblyopia, or lazy eye. Scientists are working on the exact duration and timing for the treatment, which they hope can be used on children.