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A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.

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Common abbreviations that cause medication errors include U (unit), mg (milligram), QD (every day), SC (subcutaneous), TIW (three times per week), D/C (discharge or discontinue), HS (at bedtime or "hours of sleep"), cc (cubic centimeters), and AU (each ear).

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According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.

Gas exchange across body surfaces. Gas exchange across body surfaces.
Ears pulled back flat against the head with teeth bared and white of the eye showing, indicating ang Ears pulled back flat against the head with teeth bared and white of the eye showing, indicating ang
Apply compression and kneading to thigh muscles. Address the entire thigh: anterior, posterior, ... Apply compression and kneading to thigh muscles. Address the entire thigh: anterior, posterior, ...
Earth emits radiation back out to space from all surfaces, both day and night Earth emits radiation back out to space from all surfaces, both day and night
Red blood cells with normal hemoglobin, like the three similar ones, are smooth and round Red blood cells with normal hemoglobin, like the three similar ones, are smooth and round
Landmarks: Posterior thorax Landmarks: Posterior thorax
Video: Renal Failure

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