Sodium was first isolated by Humphry Davy in 1807 by the electrolysis of sodium hydroxide. Many sodium compounds are useful, such as sodium hydroxide (lye) for soap-making and sodium chloride for use as a de-icing agent and a nutrient (edible salt). Sodium is an essential element for all animals and some plants.
Facts About Age-Related Macular Degeneration This information was developed by the National Eye Institute to help patients and their families search for general information about age-related macular degeneration.
Macular degeneration is a common cause of blindness and vision problems among older people. Macular degeneration is also called age-related macular degeneration, or AMD. AMD damages the macula. The macula is a part of the eye that is responsible for seeing sharp details directly in the center of the field of vision. Damage caused by AMD can interfere with: The ability to see straight ahead.