Extreme adventurer and educator Dan Buettner has broken world records, cycled the globe and sought answers to some of humankind's greatest mysteries. Now he sets his sights on a new frontier: unearthing the secrets of healthy longevity.
Most of us take our eyesight for granted. But without proper care, nutrition, and protection, our eyes are vulnerable to damage and degeneration. Find out what you can do to keep your vision crisp, even as you age.