The drops enable ophthalmologists to get a far better look at the tiny, complicated world inside your eyes.

When your doctor presses on your abdomen, he or she is feeling to see if any major internal organs are enlarged or tender, making them painful to touch, which could indicate disease.

What can doctors see on an X-ray? Large and small fractures are first on the list.

Doctors usually don't look inside your nose unless they have a specific reason. Usually, they are looking for an infection or allergy. Sometimes, they're looking for other sources of your breathing problem, such as a deviated septum, the term doctors use to describe a misalignment of the cartilage that runs down the center of your nose.

Did you know that electrical currents flow throughout your body? Because the strongest of these travels through your heart, doctors are able to monitor your heart by placing electrical sensors on the surface of your skin. They do this by giving you an electrocardiogram -- abbreviated either ECG or EKG (from the original German spelling of the word).

In adults, a screening blood sugar test is generally used to determine if your blood sugar is too high. For adults, having an elevated blood sugar usually will not give you symptoms and may indicate a pending or current problem with type 2 diabetes.

Few tests can match the routine urine analysis for telling your doctor what's going on inside your body.

When you feel chest pain from blocked arteries, you might see an interventional cardiologist for treatment.

A cataract is a clouding of the eye's lens, a clear, soft structure behind the pupil that works much like a camera lens. The top cause of cataracts is aging. In fact, more people over 70 have cataracts than not.

Many people worry about having their large bowel examined with a colonoscope. While anxiety is normal, the colonoscope is an amazing instrument that gives gastroenterologists like me a very close view of the large bowel, also called the colon.