Advice 1: How to check sunglasses

Sunglasses often act as a stylish accessory, but it is desirable that they can fulfil their primary function. Lenses differ in the degree of tinting, color and ability to reflect the sun's rays. In addition, the glasses can be polarized, photochromic, or tinted.
Sunglasses differ by the factor of absorption of visible light and ultraviolet rays.
Instruction
1
Choosing sunglasses for sun protection, look for those models in which the lenses are closest to the eyes, but not touch eyelashes. In these glasses you will have less to worry side light.
2
There are five levels of protection points from light effect: transparent, light, medium, strong, and maximum. As a rule, manufacturers say the figure in the product certificate. Cheap glasses the degree of protection indicated on the sticker placed over the lens. There you can find a note about UV protection. To verify the accuracy of information on special equipment by an ophthalmologist.
3
Manufacturers produce glasses with different types of lenses as absorbing radiation, and reflecting it. Well-tinted Windows filter visible light, but ultraviolet waves protect the weak. In the sale easy to find glasses with black, brown, yellow, green, blue and pink lenses — it all depends on the fashion season and the imagination of the designer. However, when purchasing such a accessory you must consider that the yellow and brown glasses although protect from bright light better than others, but distorts color, so not suitable for driving. The eye safe lenses are gray or gray-green.
4
Tinted lenses can be useful in bright light, but indoors will be a hindrance. Universal solution are the photochromic glasses, known at home as "chameleons". Their lenses are made with the addition of special substances to darken under intense lighting, so they are able to change the transparency depending on the external conditions.
5
Polarized lenses — the best solution for athletes and drivers. Through technology, developed in 1937, they protect from direct sunlight, without reducing the depth of colour and detail. The famous manufacturer of polarized sunglasses — Polaroid — also produces a tinted model. So before buying you must ensure that you choose the suitable glasses. To do this, look through them for any LCD and tilt your head 45 ° to left or right. If the image blacks out completely, lenses are truly made according to the technology of polarization.
6
In addition to toning and polarization of lenses is frequently used in mirror coating. Thanks to a thin layer of reflective lenses produce less heat, and better protect the eyes from part of the spectrum. On the other hand, the coating easily damaged, the lenses are covered with scratch and are long.

Advice 2: How to distinguish fake sunglasses

Copies of the fashionable sunglasses are so well-known companies have filled the Russian market that even the purchase of glasses in an expensive boutique can not be a guarantee that you will get the real branded thing. Of course, it's a shame to pay a large sum of money for a fake. But much more dangerous is that the fake sunglasses do not provide the necessary protection. But sunglasses are first and foremost, we need it in order to protect your eyes from harmful radiation. Fashion and beauty in this case is secondary.
How to distinguish fake sunglasses
Instruction
1
Pay attention to the case. Good brand models are sold only in case. Even the leather case is tough enough to protect the glasses from deformation and damage. On the company's case the company logo of the manufacturer must be engraved, not printed. Some firms include in the kit a small screwdriver to pull the rims
2
In the set of signature points are always: booklet, tissue paper for cleaning lenses and a passport or certificate.
3
Cloth for wiping the lenses of these glasses is made from soft microfiber fabric, the edges do not fall off, on a napkin, the logo of the company. In addition napkin to wipe is packaged in a plastic bag and included inside the box.
4
The booklet must be printed on good paper, with no spelling errors. The printing ink should not move, if it to wet a finger.
5
Pay attention to the temples of glasses. Inner side shall bear the inscription indicating the model number, color symbol, the symbol of conformity with the European quality standard (CE), level of sun protection. All labels should be smooth, crisp, not worn.
6
Coating eyeglasses branded glasses always stable, it can not be scratched or erased. Therefore, any defects on the rim or the traces of glue is a sign of counterfeit. The branded sunglass screws always painted in the same colour as the rims, the paint on the screws do not need to peel or crumble.
7
Don't be lazy before you purchase to visit the website of the manufacturer and download your chosen model. She must meet all specified parameters. The store also ask for a catalog and verify that the selected model is presented.
8
Put on the glasses. Turn the head from side to side. Good glasses should sit tight, not sliding during movement. Make sure that the glasses sit on the bridge of the nose smoothly.
9
View through the glasses on bright light. If you feel uncomfortable, most likely the lenses are not have a reliable protection and are fake.
10
These branded sunglasses can not be cheap. So check on the Internet the approximate value of points selected brand. Too low price should alert you.
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