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 usually affects people aged over 50 and is known as age-related macular degeneration or AMD. This condition happens when ageing affects the retina at the back of the eye. This is the nerve tissue that sends signals about what you see to the brain.