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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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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.