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.
Did you know?
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.
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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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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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Spectrum of the Cosmic Microwave Background
Johannes Gutenberg, Page from the Forty-Two-Line Bible, Mainz.
