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How to choose sunglasses
Material shall be a primary criterion in choosing sunglasses, because health is more important to the style or image. Glasses not only help protect your eyes from bright sunlight, but also do not allow UV light (only glasses with glass lenses). Just wanted to say that too small glasses (whether glass or plastic) though will look stylish, but will be a poor tool in sun protection.

Sport, recreation and sunglasses
For sports sunglasses special requirements. They not only must reliably protect your eyes from the sun, but have increased strength, to be made of special plastic, not glass, because glass increases the risk of eye injuries. According to statistics, 90% of eye injuries could be prevented if protective eyewear, with nearly half of all injuries occurring in children under 14 years.

How to choose glasses for a child?
In the first year of life, the main indications for correction are aphakia and high myopia. In children under the age of three leading indications for correction of hyperopia is for esotropia. Preschool children (3-7 years) to correct aphakia, congenital myopia and hyperopia are added early acquired myopia and astigmatism. At school age, the leading indication for the correction of myopia is acquired.

How to pick the right rims of the glasses?
New Year - the right moment to change the old, familiar, or start something new. For example, you can radically revise its image, or even just thinking about it. Think we'll start with the principal, and most importantly to us, loved ones, of course, the eyes, and everything associated with them.

What you need to remember when choosing a frame for glasses?
Participation points is a fairly serious procedure. Many people, especially women, are choosing to purchase the frames as a costume or decorations. The frame should be modern, "trendy" and yet have to face, color and styling your hair, and jewelry.

Improving appearance points lenses
Vysokoprelomlyayuschie lenses made of organic materials can significantly improve the appearance of spectacles. Using the lenses of materials with refractive indices from 1.60 to 1.74 can substantially reduce the thickness and weight of lenses and glasses to make a superficially more attractive, even at high degrees of ametropia. Variety vysokoprelomlyayuschih range of lenses in combination with optical coatings, which offer today, many manufacturers, often puts consumers in a quandary: what lens to choose? To make the right decision, we must understand the basic characteristics and features of the lens material with high and superhigh refractive index.

Contact lenses
It is believed that the eyes of the lens blush, "dried" lacrimal gland, eyes acquire a specific shine (not the greedy, not that ravenous), triggered by a myriad of diseases and so on. I wear lenses for more than 4 years. With regard to shine in the eyes and other cosmetic effects of the MCL, then I am with my close friends spent the experiment: one in the eye lens, the other without.

Spectral points or more on computer vision syndrome
American Association of optometric studies published data on the new occupational disease "Computer vision syndrome" - (KSZ). Computer vision syndrome in one form or another is observed in 100% of computer users. His symptoms are familiar to almost everyone who holds the monitor more than 4-5 hours a day. Ophthalmologists note the rapid growth of cases of SGC. For example, in North America with typical complaints of the SGC to the doctors turned to 1992, 10 million people. In 1996 - 15 million people., And in 1998 for 22 million people.

Polarizing eyeglasses. What do they differ from ordinary sunglasses?
Although the cost of those and other quite comparable, but the fishing is desirable polarized glasses. How to check whether the data points polarizing? Very simple. Take two pair, and lean their glasses to each other. You will be able to see through them. I now turn to some points by 90 degrees. If you continue to see through the glass, then the conventional glasses, but if you do not see - that's all right - you are in the hands of polarized eyeglasses. What it does affect fishing?

Sunglasses - Accessory enigma
The bright sun is often the cause of the appearance of wrinkles. On clear summer days, it is impossible to watch without squinting his eyes, especially if it is near sea. Sunlight reflected by water, shine in mercy. The only salvation in the hot, cloudless days are the sunglasses.

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Sunglasses


Sunglasses play a huge role in maintaining eye health and visual acuity, because ultraviolet radiation is very negative impact on external and internal structures of the eye. The increase in solar radiation due to thinning of the ozone screen and education of ozone holes in the atmosphere every year is more and more of ophthalmologic diseases. 

When choosing sunglasses main criterion should be not the style, shape or color of frames and quality lenses and coatings. Note that glasses of low quality may well have the opposite effect - not to protect the eyes, and put them at risk burn or reduce the view. The fact is that cheap sunscreen optics or is completely ineffective coverage, or has no itself at all. As a result, pupils are expanded from the intense ultraviolet radiation, and this leads to the fact that the eye gets more more rays of violet and blue part of the spectrum. Often, this is what causes the surface of the eye burns, development fotokeratita, increased tearing, photophobia. 

Quality sunglasses are equipped with a special coating that absorbs ultraviolet radiation. But do not think that they are capable of absorbing ultraviolet radiation in full - the lens is stopped, only those rays that are directed along the visual axis of eyeballs. Nonetheless, the eyes still gets some part of solar radiation, since rays are ability to bend around obstacles, ie the lens. In addition, some part of the radiation reflected from the inner surface of the glasses and also falls into the eye. However, if the glasses really meet international quality standards, they miss very little of ultraviolet radiation, non-hazardous to the health of the eye. 

Particular attention should be paid to children's sun glasses - the children's eyes are several times more sensitive to ultraviolet so they need expensive glasses with lenses fitted with a olycarbonate filter. 

This is interesting:
Sunglasses are needed not only to sunbathe on the beach - without them it is impossible to visit the solarium. Quartz lamps in such institutions are sources of strong ultraviolet radiation, which is many times stronger sun. 

Lenses sunglasses are several types: conventional corrective spectacle lenses made of colored glass, a lens with surface staining, photochromic lenses, lenses with sun-coated, with a mirror coated with antireflection coating. 

Corrective color lenses are made from mineral glass. They perform two functions - correct eyesight and protect the eyes from sunlight. Most colored lenses are produced by adding the glass of metal salts - salts of cobalt and nickel, for example, give a violet glass, the salt of cobalt and copper - blue, chromium salts - green, cadmium and iron - yellow, gold, copper and Selenium - red. Mixing of different salts can produce lenses with varying degrees of light transmission. The main difference between these lenses lies in the fact that their optical density depends on their thickness. Sometimes this is inconvenient, because the thick lens is not always look beautiful in a frame, and generally make spectacles heavy and cumbersome. 

A much better effect is obtained by surface staining of organic lenses. The most popular are gray, brown, green, blue and yellow colors. Color lenses largely determines the color perception of objects and objects: gray, for example, gives a uniform color, brown - increases contrast by mute blue and blue and green gain. Photochromic lenses are most in demand in the manufacture of prescription sunglasses that is manufactured to order for a particular patient. In particular, they are suitable for astigmatic corrective glasses. 

Sun coverage used for the application of mineral lenses with diopters. This is probably the most popular type of points the sun, but they do not provide absolute protection. Even as tainted by 80-85%, they miss the ultraviolet range 320-340 nm, ie UV-A radiation. These glasses are best suited for short stay in the sun. Several years ago, were extremely popular sunglasses with mirror coating on the lenses. Now the demand for them has fallen somewhat. The mirror effect reaches deposited on glass metal oxides: titanium, zirconium, and others. Since recently became fashionable gradient mirror coating that covers only 25% of each lens. These points reflect excess sunlight, and the average part of the lenses act like normal corrective glasses.