Corneal ring implantation is a type of eye surgery. It puts a small ring of plastic into the cornea. It is done to fix an eyesight problem, so you can see more clearly.

Convergence insufficiency (CI) is a problem with the way the eye moves. It makes it hard to focus on things nearby. When the eyes converge, it means they point inward (toward the midline) to focus on something close. With CI, the eyes have trouble doing this. One eye may turn out instead of looking inward. CI can cause blurred vision, double vision, and eyestrain.

Left bundle branch block is a problem in the heart's electrical system. It causes the left lower chamber (ventricle) of the heart to pump more slowly than normal.

Your immune system’s job is to find and destroy things in the body that may cause harm. But in some cases, the immune response can be a problem. After a heart transplant, your immune system sees your new heart as a threat. It can start to attack the heart. This is called rejection.

Eosinophilic esophagitis (EoE) is an allergic reaction. It occurs in the esophagus.

CPVT is a rare genetic condition that causes a serious irregular heartbeat.

Aortic valve regurgitation is when the aortic valve leaks. The aortic valve is one of the heart's four valves. It is on the left side of the heart. It sits between the lower chamber (ventricle) and the large blood vessel that sends blood to the body (aorta).

Ear barotrauma is a type of ear damage. Learn more about this condition, including causes, symptoms, diagnosis, and treatment.

Obesity is a complex problem. A general healthcare provider can offer help with weight loss. But a bariatric healthcare provider has more training in how to treat obesity.

Simple kidney cysts are fluid-filled sacs that form in your kidneys. These cysts often don't affect how the kidneys function. Simple kidney cysts are very common. They rarely need treatment. Most people don't even know that they have them. Read on to learn more.