|
|
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.
Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
Approximately 500,000 babies are born each year in the United States to teenage mothers.
Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.
![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)
![Palpating the thyroid gland from behind the patient is a most effective way of assessing the gland f](https://biology-forums.com/gallery/47/medium_14755_07_10_12_2_58_09_93201621.jpeg)
![A physician is performing a colonoscopy on a client and viewing the internal structures of the colon](https://biology-forums.com/gallery/47/medium_18099_24_10_12_4_35_31.jpeg)