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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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History of contact lenses 


Many people believe that contact lenses, unlike eyeglasses were invented relatively recently. It's not quite true. Point that widespread they actually received only in the second half of the twentieth century, but the first attempts to establish a contact lens have been made yet in the XVI century. 

In the historical archives contain sketches of the famous Leonardo da Vinci, who in 1508 developed a kind of device, designed for vision correction. It was assumed that the optical system must be installed on the eyes and improve the ability to see. Scientists are confident that this invention is of great genius and has become the prototype of the modern contact lenses. 

The optical system proposed by da Vinci, not interested in public at the time, and happily forgotten about it almost four years. Only in 1887 glassblower from germanskogo city of Wiesbaden Friedrich Muller took advantage of this idea. One of his friends there was no lid, but it is well known that not only protects the eye, but also prevents drying of its surface. To help the suffering, Mueller made the glass spherical lens and put on his eyes, that it prevents water loss. 

This patient wore the lens for more than 20 years, and with age, when his eyesight began to deteriorate, he noticed that the eye under the lens sees much better than the other. Later Mueller engaged in the manufacture of such lenses and other people suffering from visual impairments. 

They represented a prosthesis of the same shape eyes. That portion, which is adjacent to the sclera was made of white glass, and over pupil lenses were transparent. After nearly thirty years, also in Germany, a well-known company "Carl Zeiss has developed the mass production of special collections contact lenses. Each kit consisted of lenses with different parameters, making it easier to find a suitable pair for eye of each individual. 

It should be noted that until the mid 50-ies of XX century contact lenses are made of glass and had the same dimensions:

diameter of 20-30 mm, thickness 1-2 mm. They covered almost the entire visible surface of the eye - the cornea and sclera. As a result, under they often accumulate fluid, causing swelling of the corneal envelope, and as a consequence, the image distortion blurred vision and pain. After removing the lens patients had to be treated for a long time to recover normal transparency of the cornea. 

And only in the late 50's the situation changed for the better, when Czech scientist Otto Wichterle invented the transparent stable polymer, perfectly suitable for the production of soft contact lenses. This hydrogel polymer was able to be saturated with water, flow of oxygen to the surface of the eye, which did not cause edema of the cornea. Since 1971, the development Wichterle was the basis of mass production of soft lenses, making them accessible to everyone. 

Another major breakthrough in optics occurred in 1947, after Kevin Taucha made the first contact lens small diameter. It closed only the cornea, and it served as the material for plastic. Then contact lens purchased its modern form.