It’s easy to take your good vision for granted until something happens to go wrong. The human eye weighs about a quarter of an ounce and is roughly one inch in diameter, but don’t let its small size fool you. Eyes are complex, letting you see color, shape, and movement thanks to the millions of tiny cells inside them. In this infographic from Dr. Mark Hornfeld of New York City , you’ll learn many fun facts about the eyes. For example, about half of all Americans use some sort of vision correction, which means there are many people who could benefit from Lasik surgery. You might also be surprised to learn that babies don’t shed tears until they are between four and 13 weeks old. Explore this infographic for more interesting eye information, and please feel free to share it with your friends and family!