After age 40, many of us start to lose the ability to see up close. So-called presbyopia (which means "old eye" in Greek) happens because it's harder to focus on nearby objects as the eye's lens gradually gets harder and less flexible. Alas, no exercise, medicine, or food (sorry, carrot lovers) can prevent this deterioration. You may start by holding reading material farther and farther away, but eventually, you'll "find the arms are a little bit too short," says Douglas Koch, M.D. professor of ophthalmology at Cullin Eye Institute, Baylor College of Medicine. Time for granny glasses? Not necessarily. The good news is, there are lots of approaches now for aging eyes besides bifocals.