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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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If you could remove all of your skin, it would weigh up to 5 pounds.

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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.

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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.

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In inpatient settings, adverse drug events account for an estimated one in three of all hospital adverse events. They affect approximately 2 million hospital stays every year, and prolong hospital stays by between one and five days.

Platystictidae is a family of damselflies, commonly known as shadowdamsels. Platystictidae is a family of damselflies, commonly known as shadowdamsels.
Life-cycle of the Sun; sizes are not drawn to scale Life-cycle of the Sun; sizes are not drawn to scale
Cardiac catheterization. Insertion of a tube called a catheter through a blood vessel. In this examp Cardiac catheterization. Insertion of a tube called a catheter through a blood vessel. In this examp
Blood supply to the pituitary gland Blood supply to the pituitary gland
Blood cells Blood cells
How many chiral stereoisomers can be drawn for CH3CHClCHBrCH3? How many chiral stereoisomers can be drawn for CH3CHClCHBrCH3?
Video: Attention Deficit Disorder (ADD)

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