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If you see someone wearing glasses like that, do you have question marks all over your head? However, wearing such a strange pair of glasses is not for the pursuit of fashion, but an important tool for people living in the Arctic Circle to protect their eyes.

Can you call these glasses?| Wiki Many people know that snow appreciation can also hurt their eyes. Under intense ultraviolet light, the eyes are likely to get "snow blindness," which is electric ophthalmia. When the eyes are exposed to intense ultraviolet rays, they will feel like they have been "sunburned," with intense foreign body sensation and pain, tears and blurred vision.

It's not just snow in nature that can hurt our eyes. Welding and other artificial flashes can also cause varying degrees of damage. Therefore, welders often wear welding glasses. Sunglasses or other colored protective glasses are also a necessity when walking in snow.

UV rays reflected from snow can cause eye damage.| Pixabay But if we trace the history of sunglasses, perhaps we know that sunglasses have a long history. In the 18th century, an English optician developed tinted lenses with blue and green colors, and it was not until the 19th century that glasses designed specifically for light-sensitive eyes appeared.

But about 14,000 years ago, Eskimos entered the Arctic in a great migration and settled in the ice. How do they prevent snow blindness?

The answer lies in a pair of funny-looking glasses like this. For thousands of years, Arctic dwellers have used such glasses to protect their eyes from ultraviolet rays reflected from the snow.

Wooden snow mirror.| The glasses can be made from a variety of materials, such as walrus teeth, driftwood, bones, antlers and even grass from the Arctic continent. All you need to do is sculpt them to fit your face and cut two slits in the middle.

Although it looks simple, it can meet the eye protection needs of Arctic residents. These small gaps allow only a small amount of light to pass through, so the eyes are not "sunburned" by a large amount of ultraviolet light.

And glasses made of reindeer hooves and seal skins.| National Museum of the American Indian and through the cracks of glasses, people can see better. Because it will achieve the effect of focusing, which is the same reason that we squint our eyes to see, it will be clearer.

To focus and see more clearly, there is a professional type of glasses called pinhole glasses. Instead of the familiar transparent lenses, it is a plastic sheet with many small holes. Although it looks simple, it can also improve vision.

Do these glasses really not look funny?| Wiki Our ordinary transparent glasses are able to redirect light and focus it onto the retina. But these pinhole glasses work by limiting the amount of light that enters the eye. Therefore, if you are a little nearsighted and can't see things clearly in the distance, wearing pinhole glasses will find that you can see more clearly.

These glasses are often used by doctors to diagnose patients 'eye conditions. It can also temporarily improve myopia and hyperopia. However, this kind of glasses only temporarily improve vision, take off pinhole eyes, it will return to its original state, will not improve vision, but can play a role in preventing myopia.

It suddenly becomes clear.| Wiki, however, although wearing them will see better, but look at the picture, you can see through these glasses, the light will become very dark. So don't wear it when reading or driving.

Except in the snow from strong ultraviolet interference and even damage. In daily life, when sunlight causes discomfort to the eyes, glasses are also needed.

Legend has it that thousands of years ago Roman emperors watched gladiators fight through cut emeralds to reduce sunlight interference. The world's first pair of sunglasses may have been invented by the Chinese in the 12th century.

The Chinese at that time would put a smoked quartz plate on their face to block the glare. But in addition to blocking sunlight, the glasses are also worn by judges to hide their facial expressions.

Ancient Chinese glasses still look familiar?| icollector.com It took a long time to develop, and it was only in the 19th century that people began to advocate using sunglasses to protect their eyes from UV damage. In the 1900s, Sir Crookes in England invented a lens made of cerium (Ce) glass that completely blocked ultraviolet light. In the 1920s, sunglasses began to be popularized.

Today, sunglasses have a variety of lenses to deal with a variety of scenarios. Sunglasses are required when flying aircraft and vehicles and doing all kinds of ice and water sports. It is worn even in space to protect against higher levels of ultraviolet and infrared radiation.

They use sunglasses with a thin gold coating and spacesuit helmets with sun-reflecting coverings and tinted sun visors.

Swedish astronauts have worn sunglasses on space missions.| Wiki sunglasses have a wide range of applications, and its functions are not only protected from UV damage, but also rich in decorative functions. However, its ancient ancestor was still a pair of strange glasses simply carved from wood thousands of years ago.

Aren't you going to make your own sunglasses?

This article comes from Weixin Official Accounts: Bringing Science Home (ID: steamforkids), by Skin

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