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A clear lens in the eye focuses light. This lets the eye see images sharply. With age, the lens slowly becomes cloudy. The cloudy lens is a cataract. A cataract scatters light and makes it hard for the eye to focus.

Some chemicals cause burns. Others may be absorbed through skin or lungs, causing hidden damage.

The right helmet and other safety equipment can protect the head when biking, in-line skating, roller-skating, or skateboarding. But they only protect if worn correctly. Here's a helmet safety checklist for parents to keep their kids safe.

If you own a gun for sport or protection, your child should never have access to it. Keep all guns and ammunition out of reach. And even if you don’t have a gun at home, talk to your child about gun safety.

Chlamydia is an infection spread through sex. It's common among young adults. Chlamydia is easy to treat, but you need the right medicine. You must get treated by a health care provider.

Chlamydia infection is a very common sexually transmitted infection (STI). Because most people do not have symptoms, chlamydia may not be noticed until it causes severe problems. Left untreated, this STI can cause people to become sterile.

Cancer starts when cells in the body change (mutate) and grow out of control. These cells can form lumps of tissue called tumors. Cancer that starts in the cells of the colon is called colon cancer. Cancer that starts in the cells that make up the rectum is called rectal cancer. These cancers are a lot alike, so they're sometimes just called colorectal cancer.

Most insect bites are harmless and cause only minor swelling or itching. But if you're allergic to insects, such as wasps or bees, a sting can cause a life-threatening allergic reaction. The venom (poison) from scorpions and certain spiders can also be deadly, although this is rare. Knowing when to get emergency care could save your life.

While a slight cut or scratch to your cornea is minor, some eye injuries can be very serious. Learn when you should go to the emergency room, and what treatment options to expect.