Forms of sunglasses: individual choice

Forms of sunglasses: individual choice
For spring and summer
For children
Legendary form

shaped sunglasses Today, sunglasses remain popular not only because of fashion, but also for research, the results of which indicate that the dark glasses help prevent various health problems. You can choose any shape of sunglasses that perfectly complement the image and emphasize the dignity of the person.

From the history

The very first sunglasses were created in China in about the 14th century. They were not to protect your eyes from the sun; they were judges to conceal the expression of the eyes during the hearing. Any information on how the judge evaluates the testimony of witnesses, the plaintiff and defendant, but had to remain a secret until the very end of the process. Points, used by judges, were made of smoke-colored quartz.

Gradually, these glasses have become used to protect from the sun, but in China it was not their main function. Around 1430 began to use dark glasses for vision correction. They were brought from China to Italy, but here, too, began to use the glasses mostly in court.

In the mid-18th century Dzheysm Eyskou experimented with tinted lenses, of which tried to make points. They, too, were not sun; Eyskou believed that blue and green glass can correct specific impairment. Exposure to sunlight on the eyes did not bother him.

Sunglasses in their modern sense appeared only in the early 20th century. In 1929, Sam Foster, founder of Foster Grant, sold its first sunglasses one of the shops in Atlantic City. By 1930 points already gained considerable popularity. In 1930, the company Bausch & Lomb has received an order from the military and the US Air Force to develop effective points that would protect pilots from glare at high altitudes. Physics and Optics of improved existing at the time of dark green lenses, so they began to protect the eyes from a wide spectrum of light.

In 1936, Ray Ban sunglasses aviators created by using polarized lens technology, authored by Edwin Land, the founder of the corporation Polaroid. The underside of the eyeglass lens was specially lengthened in order to best protect the eyes of pilots often watched down on the dashboard, which was reflected by a blinding light. Already in 1937 points, which have become known as points aviators Ray-Ban, went on public sale.

In the 1970s, sunglasses have become especially popular among Hollywood stars and fashion designers, and that's when it started to purchase accessory truly widespread popularity. Just a couple of decades, has developed a huge industry for the production of glasses.

Frequently asked questions about sunglasses

If the sun does not shine in my eyes, whether you want to wear glasses?

Yes. Ultraviolet radiation, which is part of sunlight can cause photokeratitis irreversible retinal damage and other problems.

What is ultraviolet radiation?

Ultraviolet radiation (UV) starts right after the violet region of the spectrum (UV begins after the X-ray range); its main source is sunlight. There are three types of UV:

Ultraviolet A - the long-wavelength range, easily penetrates through the glass. Experts still can not come to a consensus on how this type of UV is dangerous to the eyes or not.
Ultraviolet B - medium wave band, the most dangerous radiation, due to which the use of sunglasses Sunglasses: The ideal protection for your face creams, and is now considered mandatory. Beams of this type do not penetrate the glass.
Ultraviolet C - shortwave; this type of emission does not reach the earth, so it blocks the planet's atmosphere.

Dangerous to humans UV radiation penetrates through the clouds; It is most active between 10 and 2 hours of the day.

How to protect your eyes from UV?

Sunglasses are precisely intended to protect the eyes from ultraviolet radiation. While some contact lenses Contact lenses: blessing or curse? provide some protection against UV, they do not close their eyes fully, so sunglasses are needed anyway. Choose sunglasses that protect against UVA and UVB rays in the 99-100%. Their label may be mentioned those figures, but instead may be UV inscription 400. This means that the lenses block all light rays with a full 400 nm (here includes all UVA and UVB rays). In addition, the lenses must be sufficiently large to turn a blind eye on top, bottom and sides.

What kinds of lenses are at the sunglasses?

Spectacle lenses are different in many ways. For example, lenses that block blue What colors are combined with blue: the fashion new solutions As the name implies, blocks the rays of the blue part of the spectrum, which is considered to increase the risk of eye damage and the development of various diseases. Such lenses are amber or brown. Lenses other colors to a lesser extent protect against these rays, moreover, some of which may distort the colors of visible objects. The most popular brown, dark amber and gray lenses that distort the least visible objects, and effectively protect the eyes.

Polarized lenses and lenses with antireflection coating to protect from direct sunlight and reflected light. They are often used by people involved in water and winter sports.

Lenses and especially reflective coating greatly reduce the number of rays that penetrate through the glass. Points such lenses in some cases essential, for example, if you're going to ski on a sunny day. The color of the mirror coating does not affect the perception of color, the color is important only lenses themselves. For everyday use, especially in cloudy weather, mirrored sunglasses - not the best choice: they obscure some visible objects and can reduce contrast.

Gradient lenses are tinted so that the top of the lens is darker, and at the bottom gradually brighten. Sunglasses with such lenses are suitable for driving, as they protect the eyes from sunlight falling on top and allow virtually no distortion to see the dashboard.

Lenses with dual gradient darker top and bottom, and lighter - middle. If you're looking for is not too dark glasses, which, however, will reliably protect your eyes from the sunlight from above and from the reflected light from the bottom, glasses with lenses so - for you.

Photochromic lenses are the darker, the more they will be exposed to ultraviolet radiation. They are especially useful for people who spend on the street a lot of time, including children.

What color lenses to choose?

As already mentioned, the most popular are brown and gray lenses, because they are not only effectively protect the eyes, but minimally distort the colors of visible objects. Skiers and people involved in the shooting, prefer yellow lenses, since they increase the contrast. Green lens to a lesser extent improve contrast, but they did not so much as yellow lenses distort colors. Red and pink lenses contribute to the contrast but cause severe color distortion.

Do I need to need protection from UV, if the lenses and so dark?

Required! Most people think that the dark lenses themselves serve as protection for the eyes. For such lenses you may indeed be comfortable, however, exposure to UV is characterized in that it is hardly noticeable as long as there are serious health problems. So be sure to buy sunglasses with full UV protection.

Do children need sunglasses?

Yes. Children spend more time in the sun than adults, and their eyes are more sensitive to UV light. The damage that UV causes, tends to accumulate over the years, and the task of adults - start as soon as possible to protect the eyes of their children.

I wear glasses for vision correction. How can I protect my eyes from the sun?

You can buy sunglasses vision glasses or glasses with photochromic lenses. Less expensive, but less convenient option may be goggles with interchangeable lenses.