Many Americans assume tuberculosis is a disease of the past, but the reality is one-third of the world's population is infected with TB - an estimated 10 to 15 million people in the United States alone.Second Opinion explores this historic disease and what you need to know to protect yourself.

Many Americans think loss of vision is a normal part of aging. Think again. The number one cause of vision loss is actually a disease called macular degeneration. This episode describes the disease and how you may be able to prevent it from compromising your vision.