to stop to look them in the eyes too tired

To take glasses, flat cut quartz and use smoke coloring method is very different glass and plastic lens, simply pop into the frame of glasses today dark tonal. Of course, there is a dark color to people's ability to protect themselves, from the sun, but they don't really use this objective it.
Other uses Sunglasses only started in 1430, Italy imported glasses can be corrected visual acuity. After this year, one point one, using the correct vision sunglasses and sunscreen, but they still are used by the judges, to stop people read their faces.
Even without the use of "Sunglasses" at that time, they were known as the glasses. This is until the middle of the eighteenth Century, British man James Ayscough, introduced the use of colored glass, green or blue idea to correct vision. Although the sun is it right? His main goal, he has passion, try to use different color specifications of the glasses, he hoped that he could find a way, so that they adjust one's eyesight.
In twentieth Century, becoming the new fashion sunglasses. At first, it was a movie star who needs them to protect their eyes from the trend, stage lighting. Before shooting, they will wear sunglasses, prevent dry eyes. Wearing sunglasses to stop to look them in the eyes too tired, bloodshot camera. Because of the celebrity trend, very fast mass production in 1929, by a man named Sam Foster led the United States of america. This trend began to rebound, in the state of New Jersey, where everyone wore them on the beach. Soon, everyone in the street people are wearing a pair of sunglasses.
These years, with the development of technology, the world was introduced to the Polaroid film. This is Edwin H. land of the Polaroid Co was founded in 1936, production of films, filtering and polarization light is a very economical price. Therefore, they injected the invention and creation, we now know that the polarized sunglasses glasses.