Dry eye is a condition in which there are insufficient tears to lubricate and nourish the eye. Tears are necessary for maintaining the health of the front surface of the eye and for providing clear vision. People with dry eyes either do not produce enough tears or have a poor quality of tears. Dry eye is a common and often chronic problem, particularly in older adults. With each blink of the eyelids, tears are spread across the front surface of the eye, known as the cornea.
A long string of land pressed between the Pacific and the towering Andes, Chile is 4,270 km (2,653 mi) long. â. ; it is 356 km (221 mi) wide at its broadest point (just north of Antofagasta) and 64 km (40 mi) wide at its narrowest point, with an average width of 175 km (109 mi). â. .
Atacama Desert. From the wildlife angle, Chile in Southern South America stretches in a north-south direction, called the spine of South America, has terrestrial borders with Argentina and Peru, and has long coast line of 6,435 metres (21,112 ft) on the South Pacific Ocean.apageria rosea (Chilean bellflower) is the national flower, Andean condor, (Vultur gryphus) (NT), is the national bird, and taruca or South Andean huemul, is the national animal of Chile.