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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History eyeglasses

There is hardly a man who at least once in life, did not wear glasses, either with glasses or sun diopters. However, few knows that the history of the simplest optical instrument is rooted in antiquity. Although the points as they had been invented only in the XIII century, already in ancient Rome, wealthy patricians used a special way precious stones in order to look through them in the sun. 

Almost until the middle of the XIII century the role played by thin sunglasses polished pieces of transparent crystal or glass, and their produced only one eye. Later they were enclosed in a metal frame - so there were a monocle. Such lenses were widely distributed in the territory of ancient Greece and Rome, as evidenced by many archeological finds. Excavations Troy and on the island of Crete, for example, were found lenses of rock crystal. Some scientists believe that they were used for correction view, others are inclined to think that with such lenses in antiquity lit the fire. 

Speaking about the appearance of points, ie, an optical device designed to improve vision, then it happened in Italy. Precise data are not available, so the date for the invention of points adopted in 1285 - that this is dated document in which the first mentioned points. According to other sources, points unknown steklovar invented in 1280. Pouring liquid glass mass in the form, he accidentally spilled some of it on a smooth surface. When the glass was frozen, it turned out that one of his side is flat, the other slightly convex, that is to receive an ordinary lens, refracting the light rays. Steklovar looked through her things and realized that a piece of glass increases their contours. A little later he was convinced that such a lens significantly improves of older people. The first artistic representation of points dates back to 1352, when the church Treviso in Italy was created fresco, which is one of the characters depicted in a frame with glass on the nose. 

Widespread glasses were in China during the second half of XIV century. This is evidenced by excerpts from ancient books philosopher Chao Ji Ku "Explanation of mysterious things." Scientists believe that the first points in China originated from the Persian and Arab merchants, who brought European goods to Asia. In one of the chronicles mention that the ruler of a small kingdom on the Malay Peninsula, presented a gift to the Chinese emperor for ten pairs of glasses. At first, this optical device was is only the most wealthy citizens, but later appeared at the points of the middle strata of the population. Incidentally, the Chinese the honor of the invention glasses with tinted windows - they were made mostly of smoky quartz specifically for judges. It was believed that the tinted windows to conceal the judge's eyes that no one noticed his personal relationship to the published by the sentence. Over the next few centuries, this invention became popular almost everywhere, as smoky glass well-protected eyes from bright sunlight. However, for a long time, these points were produced by individual orders for wealthy gentlemen. In the same industrial scale production of sunglasses began in the late XVIII century, when Napoleon ordered a large party for his army, who fought in Egypt. 

Until the XVI century spectacles were attached to the nose with spacers, shaped somewhat like a divorced pair of scissors. Such an optical device was called pince-nez. The attachment was not very convenient, often painfully compressed by the nose, and the frame was kept fairly bad. And only at the end of XVI century smart enough to attach to frame strings are tied at the back, not allowing points fly with the nose. When, instead of ropes came tight bow, and then nosoupory, glasses took its modern form. 

The invention of spectacles was an important event in history, because it significantly extends the active life of people suffering from defects view. This, in turn, stimulated the development of sciences and arts - many scientists and creative people an opportunity do their work, despite the visually impaired. 

This is interesting:
There is a legend that the emperor Nero liked to watch gladiator fights through a thin lens, cut emerald and framed gold. According to other sources, emerald lens he used to admire the spectacular fire in Rome, which he himself and organized. In any case, this device may have been the ancestor of modern sunglasses.