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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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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.

 

Lens Material

Abroad, the material of choice for children is polycarbonate lenses because it is characterized by very high resistance to shock loads, and glasses with polycarbonate lenses most recessed. In the U.S., if by reason of the higher cost of polycarbonate lenses parents refuse to buy them, they necessarily give the sign a special document "Duty to warn" ("Prevention of responsibility"), stating that they received all the information about the properties of lenses and warned about the benefits of polycarbonate lenses. In Russia, in most cases, children's sunglasses are still manufactured with lenses of mineral glass. Of course, lenses based on polymeric materials is several times more expensive than mineral.

First, the lenses of plastic are 2-3 times lighter minerals. Points are made on the basis of heavy mineral lenses, may cause your child tick, disrupt the normal growth of the nasal septum, cause irritation and infection of the skin, slipping points and, therefore, inadequate correction, as well as the discomfort and reduce the motivation of the child to wear glasses .

Second, most importantly, the advantage of lenses made of plastic - high Traumatic. Children are more sedentary life, engaged in active sports and games with the use of potentially hazardous to the eyes of subjects, so the eyeglasses on the basis of mineral elements may themselves be a source of additional risk. Consequences of injuries eyes shards of broken glass lenses are very sad, so many ophthalmologists insist on the prohibition of the use of mineral elements in the manufacture of children's glasses, considering them as an additional risk factor. The use of plastic lenses contributes to the child's health, in particular organ of vision.

For high-refraction lens is preferable to plastic lenses with high refractive index. This allows a 30 per cent to reduce the thickness and weight of lenses and make points on the basis of their aesthetic appeal.

 

Protection from UV radiation

The body of the child requires greater protection from UV radiation, because:

- Children spend more time outdoors than adults;
- The lens to the retina of the child misses more UV and short visible radiation;
- Damage caused by UV radiation in the retina, are cumulative. With age, this may lead to the development of cataracts and other diseases and, consequently, to loss of vision.

Timely protect the body of a young age helps to prevent the development of diseases. Most lenses based on polymeric materials are composed of original songs of special UV-absorbers, which provide the absorption of ultraviolet component of up to 350-380 nanometers. Quality of children's sunglasses should be given special attention. Typically, parents do not want to spend large sums on sunglasses for children and, without thinking about quality, willing to acquire them at random traders.

 

Special coatings

A man wearing glasses, can experience negative feelings due to reflection of light from the outer and inner surface of the lens. The child has these feelings are compounded when working indoors classes, illuminated by fluorescent lamps, the light which has a frequency of blinking. Application of anti-reflex coating on the surface of the lens helps to reduce the sensitivity to reflections and make the glasses more aesthetically appealing.

Anti-reflex coating, applied by vacuum deposition, reduce the coefficient of light reflection from the surface of the lens and increases the light transmission. Some companies recommend the use of lenses with antireflection coatings at work at the computer, since these coatings reduce the sensitivity to flicker and the most luminous characters display.

It may be recommended to use for children's glasses plastic lens hardening coatings, which increase their resistance to the appearance of random scratches and increase lifespan. Currently, the majority of the world's leading manufacturers manufactures plastic lenses multipokrytiyami (number of layers can be up to ten), bringing them to abrasion to the mineral glass.

 

Design elements

Selection of the optimal design elements can make glasses for a child maximum light. Increasingly, for the manufacture of spectacles with lenses of high refraction, experts recommend aspherical lenses. In conjunction with vysokoindeksnym material aspheric lens may be 40 per cent to reduce the thickness of lenses - and thus their weight.

For a variety of indications doctors prescribe small patients bifocal lenses. This occurs most often in cases where a child's myopia and he needs glasses to see well blackboard, but there is no need for correction for near vision (or vice versa). Of course, bifocal lenses are a convenient alternative to the two points.

Some children do not want to have glasses, like grandmothers, "so both abroad and in Russia for the manufacture of children's glasses are beginning to use progressive lenses - with large areas near vision and minimal distortion at the edges. If parents can not afford to buy these expensive facing the lens, they are encouraged to bifocal lenses.