people wear many different reasons from a variety of life

People wear sunglasses, for many different reasons. Many people found normal, the sunlight is too bright, not wearing polarized sunglasses can cause what is known as the burned eyes. This influence will cause you burnt eyes like red-eye or blood shot eyes, and can make the person's eyes feel tired and weak. This is a little uncomfortable, people tend to be rubbing their eyes, it is not recommended to use it, because it may lead to the other eye trouble.
Metal light reflection airline pilots wearing polarized sunglasses on the plane of the reflected sunlight. The sun also reflected by clouds, resulting in burning eyes. However, people wear many different reasons from a variety of life. Famous people wear they face, and help to change your appearance. They also help by overhead, at high temperature, and the bright lighting. People wear sunglasses to hide their eyes from the others in situation, such as the red-eyed disease, or hide a black eye. They can also be used to help hide the expansion or contraction of the students, as a small amount of light, may cause some slight pain and discomfort. The blind man wearing Polarized Sunglasses hidden from the public for their own eyes the appearance of abnormal. Many people wear them as a fashion or simply look "cool".
Polarized sunglasses have gradually evolved into space. The earth's atmosphere as filtering out ultraviolet ray most, and to some extent in the light of the sun, however, there is no atmosphere in space or cloud filtering of any type of radiation, so the astronauts need sun wear them to make up for the difference in the filtration of light.