By the way, even in cloudy weather, up to 80% of harmful ultraviolet rays fall to us, and even in sunny weather we can not do without additional protection. Therefore, doctors recommend that everyone without exception use glasses and sunscreen. Learn how to choose the right sunglasses and will be content with your acquisition of a round summer!
And here is the main advice - it's better not to be stingy, so you do not have to, then regret: oh, the chain-mail was short. Buying cheap glasses on layouts that are not certified, from an unknown producer, you further damage your eyes. The fact is that just dark glasses do not prevent the penetration of harmful rays. But with dimming, our pupil reflexively expands, we do not squint, and it turns out that the eye gets even more ultraviolet!
The result is a deterioration of vision, cloudiness of the crystal, a retinal burn. The most common disease caused by harmful radiation is photokeratitis (corneal damage). As with sunburn, the sensations can be quite painful. Tearing, redness and a feeling of sand in the eyes, swollen eyelids, even temporary loss of vision - these are all symptoms of photokeratitis. Its extreme form is "snow blindness", which affects climbers and skiers. In this case, the restoration of vision will take several days, and lacrimation and irritation of the eyes can remain forever.
All these troubles speak in favor of buying the "right", not phony spectacles. In this case, it is best to contact a specialized store of optics. After all, here all the goods are certified. And it is not necessary to choose expensive brand models. You can buy glasses from not so famous manufacturers, at a price somewhere from 200 to 300 dollars, but which already perfectly protect against ultraviolet radiation.
Glass or plastic?
This question has been answered by leading world manufacturers for a long time: today most models of glasses are produced from plastic. Although in our country it is still possible to hear that, say, it is better to shield the mineral lenses (that is, glass) from the sun. First, it is not so. Secondly, plastic has many advantages: travmobezopasnost, ease, the ability to perform a variety of design and application of additional protective coating (for example, polarizing), and of course - a reliable protection against UV-radiation. The only drawback - this material is quickly "wiped" and scratched. Glasses with glass lenses are considered unsafe because of their fragility and are not suitable for an active lifestyle.
Lenses
In general, glasses are produced with conventional protective lenses of different colors. But there was a lot of "heaped" coatings. For example, the polarization improves the contrast, removes blinding glare. Glasses with such lenses are especially recommended for motorists. Check whether your model has a polarized coating (by the way, it specializes in Polaroid), you can at the optics store with a special screen or sticker. First you need to look at them without glasses, and then - in them. If an image appears on the screen, which you did not notice with the naked eye, then your lenses are polarized.
Anti-reflective (anti-reflective) coating - removes glare and "parasitic images" on the back of the lens. (This is when you suddenly see inside your glasses the reflection of objects that are behind you, or even your own eye). "Parasitic images" worsen the clarity of the vision and can cause serious problems, especially when driving at night.
Photochromic lenses, also called chameleons, darken or lighten depending on the intensity of the light. Especially they are convenient for people with vision problems who do not want to change glasses on the street. Many people, unfortunately, do not know how to choose the right sunglasses, but with our recommendations you will learn a lot.
Mirror coating - further darkens compared to conventional lenses, plus removes heat rays. Such lenses are especially recommended for swimming and skiing.
If you put on glasses with colored lenses, and the surrounding world has radically changed color, know: you have a fake on your nose. Firm lenses keep all colors natural, only slightly changing the shade. Multicolored glasses lenses for people who are interested in accurate color perception, for example for motorists, can create problems. Violation of the usual color gamut in favor of a single color noticeably dispels attention, a person wearing colored glasses is more quickly tired.
The most optimal are gray (from light shade to deep, almost black) and brown. In this case, gray provides a real perception, brown - excellent contrast, but the green becomes greener, and the bright colors - paler. For drivers, yellow is often recommended (in dim lighting). This filter reduces eye strain, improves the perception of space in depth (the risk of accident is more clearly assessed). Orange is designed to reduce the blinding effect of light at night. Green provides a decent level of contrast in low light conditions and protects from the bright sun.
Avoid glasses, the world in which you think (literally) blue and purple. In them, you risk ruining your vision literally in one summer. The fact is that these colors have a negative effect on our eyes. The predominance of the blue-violet part of the spectrum inhibits the pace of thinking and human motor skills. With prolonged work at the computer - there are headaches, fatigue, irritability. The predominance of blue-blue - enhances the effect of light scattering (this causes a danger of glare from headlights of oncoming cars).
The form
The bending of the lens also matters, but the perception already depends on the individual characteristics of the eyes: for example, you feel good with flat lenses, and with convex ones - experience discomfort. This may be due to hidden problems. For example, with a violation of binocular vision (with two eyes). The advice is: if you feel, even the slightest inconvenience, you better give up this model of glasses.
Frame
From the frame material depends not only its appearance, weight, strength, but also allergenic properties, when the skin can react negatively to contact with such an accessory. Allergy is most often caused by nickel, which is used in many alloys. Stainless steel, titanium, gold and silver are considered to be hypoallergenic. Such eyeglass frames, as nosoupory and temples, in contact with the skin, are made of silicones, acetate, other plastics or metals. It should be borne in mind that some silicones can also cause an allergic reaction.
For sports personalities
Especially carefully choose sunglasses for sports. Frames should be as light and durable as possible, with flexible temples providing a comfortable fit, adjustable elastic nose pads, with overlays of special materials on the temples, so that the glasses do not slip.
For cycling get glasses with a mirror coating, lenses of brown and green hues, photochromic. Colors: all shades of brown and some - gray and green. For traveling by car, brown, gray-green, gray colors are better to prefer. For water sports - brown and gray colors, polarizing, mirror or antireflection coating. For tennis - yellow, orange, brown lenses (it is better to see the ball on the green field), the average intensity of the color. For basketball - yellow, orange, gray, brown, antireflective and polarizing coating.
What will the markings show?
The most important thing in choosing glasses is the UV protection factor. Carefully study the inscriptions on the label, arches, the sticker of glasses. They mean the following: "UV-400" - glasses provide almost complete protection against ultraviolet, this inscription on "decent" models may not be, since at present the full protection from ultraviolet is provided by the standard of manufacture.
On the shackle of the glasses must be the CE marking: in its charge the classification of solar glass in five categories (denoted by figures from 0 to 5), depending on how much visible light they miss - from lighter to darker. Lenses of the zero category miss 80 - 100%, the first - 43 - 80%, the second - 18 - 43%, the third - 8 - 18% and 4 - 3 - 8% visible light. Zero and the first are so-called cosmetic, or image, glasses. The second one is suitable for sun protection in a city in the middle zone. In the third - you can safely go to sea, and in the fourth - to the mountains covered with snow. The principle is this: it is better to walk around the city in the beach than vice versa.
Even on the goggles is the code of the model, thanks to which you can order an identical frame or part.
How to buy?
Going for the "guard for the eyes", remember that good and quality glasses can not cost less than $ 200 (without a discount). Cheap fakes of 20 - 80 dollars, which are sold in transitions and on market portable trays, not only indecently quickly break, scratch, but also harm the eyes.
Therefore, your way to the specialized shops of optics. One more tip: before buying glasses you should be offered (in a solid institution they do) to go out into the street. In the room you can not figure out whether they suit you. An additional criterion for choosing good points can be the fact that you see them in the day better and easier than without them. By the way, in any case, do not look at the sun - only on objects. This is a common mistake of people who check when buying how good a blackout is in glasses. (Do not look at the sun like a tortoise from a cartoon!). Even super-dark lens coatings do not completely protect your eyes.
Fashion Trends
And of course, we should not forget that glasses are not only protection from ultraviolet radiation, but also a fashion accessory. So, in this season, there are big plastic frames on the floor. For men - models such as "aviator", for women - "dragonflies". Colors: black, gray, brown, dark red. Back in 2010, contrasts were very popular. For example, a black frame and green lenses. Topical lenses with a gradient coloring, that is, from above are more darkened than from below.