[History] Where Do the Glasses Come From On Earth

When appeared the glasses

About two thousand years ago, there was a tyrant

in the Roman Empire. He was very ferocious and especially liked to have fun with slaves who killed each other in the arena. But his eyes are not good, sitting in the stands can not see the cruel and cruel scenes. He ordered the craftsman to grind a pair of glasses that he could see in the distance. A dexterous craftsman used an emerald to grind a piece of concave lens for him. 

Although it was rough, it was close to the eyes, and the things in the distance were much clearer. This monochrome for the Roman Emperor is considered to be the ancestor of myopia.

Later, in China and abroad, myopia glasses and farsighted glasses made of natural crystal mills appeared one after another. British scholar He Kang, who wrote a book about crystal glasses in the middle of the 13th century, shows that for a long time, natural crystals were used to grind lenses.

Who invented the glasses 

The inventors did not leave their names in the world.

At present, we know that the earliest place to sell glasses is Venice, Italy, about six or seven hundred years ago. At that time, although the price of glass was not high, but because of its scarcity, a pair of glasses is worth a thousand dollars, which can only be enjoyed by a few nobles and bureaucrats.

At that time, the glasses were not placed on the bridge of the nose. Some glasses are mounted on the brim, and some glasses are placed in wooden frames, skeletons or hoops. When you look at things, you should hold them by hand. Some people put glasses on a belt and look at the belt. Attached to the head.

It was only at the end of the 16th century that glasses such as today could be placed on the bridge of the nose.

What is the relationship between glasses and eyes

In the past, people used glasses to pick up on the optical shop, and which one to look at clearly, which one to choose. Craftsmen grind their lenses based on their experience, and there are no strict rules.

At the end of the 16th century, astronomer Kepler unveiled the secret of the eye. He found that the black eyeball in the eyelid was a raised transparent crystal that could regulate the light that was injected. The edge muscle of the crystal has the ability to contract and relax. As the object is viewed, the crystal can become convex or flat, so that the image of the object falls on the retina behind the eye, so that people can see the clear objects. 

However, there is a limitation on this contraction and relaxation of the eyeball. Some crystals have become very convex, and they become myopia. They must be worn with concave lenses to see things in the distance. Some crystals become farsighted because they are too flat, and they need to be worn with convex lenses to see things close.

Later, there was a scientific method of examining eyesight, called "optometry." After optometry, find the right degree, you can match the most suitable glasses.

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