|
|
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.
Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.
About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.
![Zebras are several species of African equids (horse family) united by their distinctive black and wh](https://biology-forums.com/gallery/47/medium_27759_23_04_12_6_59_00.jpeg)
![Booker T. Washington in his office at Tuskegee Institute, 1900. Washington chose a policy of accommo](https://biology-forums.com/gallery/47/medium_376716_26_08_15_11_16_35_224441889.jpeg)