A look at surgical procedures to help correct refractive errors. The goal of these procedures is to reduce or even end your need for glasses or contact lenses.

The immune system works to keep germs out of the body and destroy any that get in. It is made up of a complex network of cells and organs.

Detailed information on disorders of the liver, including alcohol-induced liver disease, chronic liver disease, cirrhosis, congenital defects, hepatitis, liver tumors, and liver transplantation

One common eye disorder is conjunctivitis, sometimes called pink eye. It's an inflammation of the blood vessels in the eye membrane. Another common disorder is a chalazion—a small bump that develops on the upper or lower eyelid.

Detailed information on correcting or improving vision problems

Detailed information on the most common diagnostic procedures for cancer.

Grading and staging cancer helps determine the best treatment.

Tuberculosis (TB) is a bacterial infection that often infects the lungs. Other organs, such as the kidneys, spine, or brain may also be affected.

Usher syndrome is a disorder that is passed down through families (inherited). It's the most common childhood condition that affects both vision and hearing.

Detailed information on ears and airplane travel, ear wax, and ear cleaning.