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 formidable challenge to patients, their doctors, and our society as the costs for delivering state-of-the-art care increase. Macular degeneration, also called age-related macular degeneration (AMD or ARMD), affects the macula, which is the central portion of the retina of the eye. Our central vision (what you see directly in front of you rather than what you see at the side [or periphery] of your vision) is dependent on a healthy macula.