Recent Advancements in Optometry and Vision Scienc

London, city, capital of the United Kingdom. It is among the oldest of the world’s great cities. London is situated in southeastern England, lying astride the River Thames some 50 miles (80 km) upstream from its estuary on the North Sea. Three of the top ten museums and galleries in the world are in London and 857 art galleries in total. London is a leading global city in the arts, commerce, education, entertainment, fashion, finance, health care, media, professional services, research and development, tourism and transportation. It is the world's leading investment destination, hosting more international retailers and ultra-high-net-worth individuals than any other city. London's universities form the largest concentration of higher education institutes in Europe. In 2012, London became the first city to have hosted the modern Summer Olympic Games three times. London has a diverse range of people and cultures, and more than 300 languages are spoken in the region.