An eye disorder may have given Leonardo da Vinci an artistic edge. A neuroscientist offers evidence that the artist had exotropia - in which one eye turns outward - enabling da Vinci to switch from 3-D to 2-D and back again with ease to more easily translate details into two dimensions.

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An eye disorder may have given Leonardo da Vinci an artistic edge. A neuroscientist offers evidence that the artist had exotropia - in which one eye turns outward - enabling da Vinci to switch from 3-D to 2-D and back again with ease to more easily translate details into two dimensions.