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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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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.

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Anesthesia awareness is a potentially disturbing adverse effect wherein patients who have been paralyzed with muscle relaxants may awaken. They may be aware of their surroundings but unable to communicate or move. Neurologic monitoring equipment that helps to more closely check the patient's anesthesia stages is now available to avoid the occurrence of anesthesia awareness.

Primary glands of the endocrine system. Primary glands of the endocrine system.
The Masses, a leading Socialist magazine, featured drawings by artists, including John Sloan, as wel The Masses, a leading Socialist magazine, featured drawings by artists, including John Sloan, as wel
The locations of human primary somatosensory cortex (SI) and one area of secondary somatosensory ... The locations of human primary somatosensory cortex (SI) and one area of secondary somatosensory ...
Ekman’s six primary facial expressions of emotion and one combination facial expression. ... Ekman’s six primary facial expressions of emotion and one combination facial expression. ...
The thymus, a primary lymphoid organ where T cells mature. The thymus, a primary lymphoid organ where T cells mature.
Remote satellite monitoring of gross primary productivity across the United States. The differences Remote satellite monitoring of gross primary productivity across the United States. The differences
Video: Component of feedback systems & Communication and regulation of body systems

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