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.
Age-related macular degeneration (AMD) is gradual damage to the cells of the macula. This condition is most common in people over 60 years old. It causes blurry vision, especially in the center of the field of view.