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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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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.

Sprain. A sprain involves damage to one or more ligaments, and is categorized into three degrees of Sprain. A sprain involves damage to one or more ligaments, and is categorized into three degrees of
A hearing-impaired patient using an interpreter. A hearing-impaired patient using an interpreter.
Selective breeding of maze-bright and maze-dull strains of rats by Tryon (1934). (Data from Cooper, ... Selective breeding of maze-bright and maze-dull strains of rats by Tryon (1934). (Data from Cooper, ...
Meiosis involves two complete divisional operations forming four potential sex cells. Meiosis involves two complete divisional operations forming four potential sex cells.
Selective Anticholinergic Drugs Selective Anticholinergic Drugs
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Video: Stress and Immune System Animation

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