Do I need to wear dark glasses and differ from conventional lenses polarized and photochromic?

Dark or, more correctly, sunglasses - an accessory, beloved by both men and women. Applies not always on purpose - is still popular jokes about how many girls use "the most fashionable in this season points" only as a rim of hair. Someone so does not represent the existence without sunglasses, what remains in them even in the evening when the sun has gone down over the horizon for a long time, and in the cafe, and the club. And this is understandable, because properly fitted glasses can be advantageous to adjust the shape of the face and give the person a special charm.

Sunglasses have become an integral part of the image, favorite thing, and collectibles. But today we will discuss only practical side wearing sunglasses: in fact, they protect from the sun and it is necessary to our eyes? Or sunlight more useful than harmful?

In discussing this question, the experts unanimously meet - ultraviolet radiation harmful to the retina of our eyes. It can cause burns of the retina and, as a consequence - the premature deterioration of vision and even blindness.

However, to our eyes it gets small enough ultraviolet light: the most rigid and harmful UV rays are filtered by the ozone layer of the radiation is blocked by the lens in our eyes. But also the minimum that still reaches the retina can lead to problems. Surely you've noticed that in a particularly sunny day eyes are very tired, they just hurt. No wonder we are beginning to squint, trying to somehow reduce the flow of incoming light, our body is better We know that it is harmful and what is useful, and does not want to miss too much of the sun to the retina rays.

By the way, from that wrinkles appear around the eyes. I understand that we are unlikely to scare the men of this fact, but nevertheless, what age your face, if you can avoid it?

So what sunglasses will certainly need you, making conclusions from the above we can definitely say:

• year particularly sunny day;
• on the beach, where water and sand (white) actively reflect the sun's rays;
• in the mountains or on a fishing trip;
• on a sunny day in winter.

But it is better to avoid wearing glasses in the room, transportation, cloudy weather, at night, when sunlight is soft and does not blind. The fact that the constant wearing glasses may develop a fear of light - photophobia. And then even the minimum light will cause you severe discomfort.

A second question arises: what kind of glasses you choose? They are now sold in literally every corner. Is suitable for eye protection is not too expensive items from the store next door, or should go to the optician and to fork over some branded sunglasses?

Here we come to the fun part. Dark glasses are not always the sun. Yes, they reduce the brightness of the color, it becomes comfortable, we stop and squint... damage to the eyes! Because ultraviolet light continues to penetrate through the tinted lenses and our deluded reduced brightness of the pupil of the light expanded and calm these UV rays miss! In addition, the poor quality of the plastic enough cheap points can simply spoil vision (for example, because of the different Alignment glasses, ie, due to the fact that the glasses are simply curves), and through them you will see a distorted, with the wrong colors.

Quality sunglasses can be glass or plastic lenses, but they have to be written by the degree of protection from UV radiation. Or the seller should be a certificate for these products, which should include all the characteristics. Nakleechka like "100% protection from UV rays" and "full absorption of ultraviolet light," it is not necessary to believe, especially if they are decorated with price points to 300 rubles.

By the way, if we talk about the price of high-quality sunglasses with UV protection, in principle, you will be able to meet the 1500-2000 thousand rubles. Of course, it is unlikely it will be branded model, but the main thing - eye protection. GUCCI will cost definitely not less than 5000 rubles. Of course, a little expensive in my opinion. But very well-known companies value their name and quality of their products, and therefore, for this amount you buy not just the lens in the frame, and the belief that the frame is not skew on the second day, the screws will not fall out, and the lens is not scratched, that the degree of UV protection as specified in the documents, and you do not cause your eyes harm.

Wander through the professional salon optics, look, think, read the documentation that you will be able to provide it. Unfortunately, my search raid on the network showed that in shops the emphasis is on the design of frames, but the information on UV protection are not specified. Perhaps, in such cases it is necessary to write in support, to clarify the characteristics of points, ask to send the certificates.

Finally, I want to consider, personally I am always interested in what is polarized and photochromic lenses and whether we need all the polls wearing them?

photochromic lenses

Photochromic lenses are popularly called "chameleon". Chameleons in the room will be normal glasses (even if the room is quite sunny), and at the exit to the street is dark, And depending on the intensity of the light. The operating principle of photochromic lenses based on the content of the lens material of the photochromic substance molecules that react to ultraviolet.

Do chameleons several features that can be safely counted among the advantages:

• these points can be with diopters. Which is very convenient for people with poor eyesight. After all, not everyone uses lenses and can choose their ordinary sunglasses, and hide my eyes from the bright sun it is necessary;
• even if the glasses are without diopters, it is still very convenient. Firstly, because the lenses react to light levels, you always get sufficient protection. Secondly, you do not have to shoot all the time, wear glasses if you kursiruete from indoors to outdoors and vice versa;
• Chameleons protect against glare, providing good clarity of vision.

It is worth noting that the car photochromic glasses do not darken in the cabin, except for special chameleons for drivers.

Polarized sunglasses

The essence of the polarized sunglasses is that they block the light glare, which interfere with our vision. In general, these patches are not particularly critical, so wear polarized glasses are not necessarily permanent.

However, there is a category of people who are polarized glasses will be very useful. This is the drivers and fishermen. I think everyone who was at the wheel, and even just sitting in the passenger seat next to the driver, know how annoying light reflected from shiny parts counter and the car in front, as well as reflections on the front glass. For fishermen points will be relevant, as the glare will be removed from the water, which prevent to see the float.

Bonus tip: how to check that the points that you have been offered in the store, really the polarization?

Take the two polarizing glasses (the same). Some put on yourself and look at the light source (incandescent lamp, the sun). Then turn the second points with respect to the first 90 °, aligning them lens to lens. Again, look at the light source. If you no longer see the light, then you can safely take these points. And by the way, for the polarizing glasses should also be specified degree of protection from ultraviolet radiation.

I wish you health and a clear view!

A photo: Flickr.com