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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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By definition, when a medication is administered intravenously, its bioavailability is 100%.
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There are approximately 3 million unintended pregnancies in the United States each year.