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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).
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The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
Cystoscopy. In this procedure, a specialized endoscope with a rigid tube, known as a cystoscope, is
Preparing a Urine Specimen for Microscopic Examination (for Classroom Evaluation Only)
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Industrial Waste and the Impact on the Environment
Diversity Amid Globalization: World Regions, Environment, Development
Two Cnidarian Body Plans