Leonardo da Vinci’s Ultra-Rare Eye Condition

According to new research, Leonardo da Vinci’s ability to understand distance and depth is the result of an ultra-rare eye condition known as exotropia. This condition turns one pupil outward, limiting the traditional understanding of depth when looking at things—which essentially would have turned the world around da Vinci into a flat canvas. This unique perspective, the new study claims, made it easier for the artist to convert the world he saw into the artwork he created—establishing fascinating takes on structural dimension. Read more at CNN.