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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.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.
Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
![Testing Visual Fields by Confrontation: The nurse and patient should be approximately at an eye to e](https://biology-forums.com/gallery/47/medium_2137_23_05_12_12_19_58.jpeg)
![Sphygmomanometry. Photograph of a physician taking blood pressure readings with the use of a sphygmo](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_15_46_100331519.jpeg)