Many people consider the sense of sight to be the most crucial of our five senses—and also the most complex. In fact, our eyes are composed of more than two million working parts. No wonder there are so many fun activities, games, and facts that make us say, "Eye Didn't Know That!"

Pass some time with us marveling at the wonderful world of sight. Test your vision knowledge. Dazzle your friends with your newfound learning. Take a virtual tour of the lab where your eyeglass lenses and frames meet up. Take a stroll through time as you eyeball important events in vision history. Explore our optical illusions, and remember, things are not always as you see them!

Some of the games and activities in this section require you have the free Macromedia Flash Player installed on your computer. If you don't already have the free player, plese visit the Macromedia web site to download and install it now.