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. .
The Chilean flag consists of two vertical stripes of equal height. The top stripe is white and the bottom one is red. In the top left hand corner of the flag, over the white stripe, sits a blue square of the same height as the white stripe. In the middle of the blue square is a white five-pointed star.he white stripe symbolizes the snow of the Andes Mountains; while the blue stripe represents the sky. The star on the flag stresses the fact that Chile is a Unitarian republic, and not a federal republic.