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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.

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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.

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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

Urinary catheterization. The procedure involves the insertion of a flexible tube, or catheter, throu Urinary catheterization. The procedure involves the insertion of a flexible tube, or catheter, throu
Embryonic and Induced Pluripotent Stem Cells & Lineage-specific Markers Embryonic and Induced Pluripotent Stem Cells & Lineage-specific Markers
To summarize, this signal transduction pathway involves To summarize, this signal transduction pathway involves
Site-specific recombination, establishing lysogeny in bacteriophage l Site-specific recombination, establishing lysogeny in bacteriophage l
Screening a library to recover a specific gene Screening a library to recover a specific gene
Allele-specific oligonucleotide (ASO) testing for the -globin gene and sickle-cell anemia Allele-specific oligonucleotide (ASO) testing for the -globin gene and sickle-cell anemia
Video: Pneumonia Animation

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