the sunglasses into mass production

In ancient Rome, Emperor Nero of Rome through the emerald like Gladiator fight, is to avoid the sun in his eyes. This may be the sunglasses before in other time periods, humans may also put all kinds of materials in their face, from the brightness of the sun, to protect their eyes, but there is little evidence, until we reached in twelfth Century.
Sunglasses, Twelfth Century is the right method, in china. They used the camera from inadequate weight quartz to block the light from the sun, and the original frame to keep them on the face of the wearer. These sunglasses did not prevent the harmful ultraviolet rays, or help the wearer to see any improvement (in fact, they are very difficult to see), but there have been a bright sun shining in their eyes, they provide some relief. Only the rich, but they found many uses - for example, China's rulers and the judge found, they can use the sunglasses to hide in their face, they say, let them appear from emotional situation.
But it was not until twentieth Century that sunglasses to really take off, however, Hollywood stars began to wear them to protect their eyes from the bright lights, studio. By 1929, a man named Sam Foster entrepreneurs put the sunglasses into mass production in the United States, and through his company, Foster Grant the Atlantic city is doing a roaring trade. 1936, polaroid filter method, let the glasses for the first time, to protect the skin from UV damage, making them an ideal project for health reasons, as well as the fashion and comfort - useful, when in the Second World War, the soldiers fighting in France in the summer day. Since then, there have been several development sunglasses, and basic science and surplus materials for the past 70 years basically is the same - but, like other useful invention period, they are still a big seller.