Glasses history
Glasses were invented by a Salvino de Amat in the 12th century. The original use was to correct front vision. The lenses of the glasses are convex, and the frame is made of metal or wood. The shape is round.This should be the earliest prototype of reading glasses.
In the 14th century, Nicholas of Cusa, Germany, produced myopia glasses to help people with myopia. the glasses use a concave lens that is thinner at the center and thicker at the end.
The earliest glasses prototype.
The initial glasses were heavy ,and could not be placed on the ears and nose,they held in the hand like use magnifying glass.
In the 17th century, the British optician Edward Scarlett invented lighter metal steel frame glasses, which can be placed on the ears and nose, and can be used with hands completely apart like modern glasses.
The upgraded glasses are easy to use.
Also in the 17th century, the American scientist philosopher Benjamin Franklin (Benjamin Franklin) invented the bifocal optical lens. He divided the lens into hyperopia and nearsightedness. The two lenses are fixed together in a metal frame.
It can be seen that, strictly speaking, the history of the invention of glasses is a history of the development of ophthalmology.
Even today, glasses are still products in the catalog of medical devices. Chinese-made sunglasses and eyewear products exported to the United States require FDA registration and certification.
Similarly, bulk import and sale of sunglasses in the United States also requires FDA registration and certification.
In order to ensure that consumers are using American quality standards, FDA needs to know who sells the glasses sold in the United States; who makes the glasses sold in the United States.
So once there is a quality problem, just can follow the source, hold accountability and solve the problem.
Sunglasses
Regarding the first birth of glasses.
There is information on the Internet that the earliest glasses came from China in the 12th century. They blackened the lenses with ink to hide the emotions of the judges at the time and conceal their own feelings.
In the 18th century James Ayscough tried to use colored lenses on glasses to improve eyesight.
We think the latter one is more accurate， colored lenses is the prototype of the sunglasses.
At that time, in addition to improving eyesight and blocking sunlight, blocking others from seeing their eyes，there is a sense of mystery and distance and increasing self-confidence. Good self-feeling may also be an important reason for people to use colored glasses.
Therefore, at the beginning of the 20th century, sunglasses were very popular in Hollywood in the United States, and many stars used them. After that, glasses began to become popular among the people on a large scale.
Girl with glasses.
In 1936, the founder of Polaroid, Edwin H. Land (Edwin H. Land) invented the Polaroid filter. For the first time, the glasses made the glasses resistant to harmful ultraviolet rays, and due to health, fashion and comfort. The reasons make it an ideal product. . .
With the brewing of World War II in 1936, Ray Ban used the new polarized lens technology created by Edwin H. Land to design anti-glare pilot glasses. One year later, The public can buy Ray-Ban pilot sunglasses.
Glasses used by pilots of World War II.
So far, glasses and polarized sunglasses have become popular all over the world.
The Ray Ban brand also became NO.1 in the eyewear industry.