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

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There are 60,000 miles of blood vessels in every adult human.

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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.

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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

Location of lysosomes and mitochondria in a cultured living bovine pulmonary art Location of lysosomes and mitochondria in a cultured living bovine pulmonary art
For a time Dr. Seuss—Theodor Seuss Geisel—drew political cartoons. This one, published in ... For a time Dr. Seuss—Theodor Seuss Geisel—drew political cartoons. This one, published in ...
Location of the heart in the chest cavity. Location of the heart in the chest cavity.
Age-related cross-sectional changes on a variety of cognitive tasks. Note that although both ... Age-related cross-sectional changes on a variety of cognitive tasks. Note that although both ...
Detonation is a secondary ignition of the air–fuel mixture. It is also called spark knock or ... Detonation is a secondary ignition of the air–fuel mixture. It is also called spark knock or ...
Exterior View of Tholos, The So-called Treasury of Atreus Exterior View of Tholos, The So-called Treasury of Atreus
Video: Homologous chromosomes during prophase I - Animation

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