Points in your favor

Brown, gray, large, like a dragonfly's eyes and almost black in sequins - it's all about sunglasses

So just buy a beautiful, but how to choose the right? Ask the experts. Tells Ophthalmologist, zavotdeleniem glasses and contact lens FSI IRTC "Eye Microsurgery" named. Acad. SN Fedorova Natalia Mokhov .

Glass or plastic?

Eyeglass made of glass or plastic. In conventional glasses without dioptric power plastic is used. But if the sunglasses are made to order and will be with diopters, you can choose from.

Yet experts recommend plastic, now it is already so high-quality, image clarity that is not inferior to the glass.

Black not to wear!

Sunglasses - it does not matter, glass or plastic, - prevent ingress of harmful UV radiation - it is their main task. Will they cope with it or not does not depend on how much they are painted.

If the UV protection is not incorporated in sunglasses with black or very dark lenses, they are not just meaningless, but very harmful when we put them on, the pupil dilates as if you were in a dark room. And after a pupil sunlight will penetrate much more than if you did not put on his glasses. In such a case can even burn the retina.

With protection from harmful radiation coped well even transparent glasses, for that the manufacture of the lenses is administered special additives or coated on the surface.

However, the degree of shading - is not only a matter of taste and individual tolerance of light. Blackout useful active insolation latitudes, the sun will be less blind. The minimum degree of dimming is designated "0" and darkens the image by 3-8%, the maximum designated "4" - very dark, hide the light of 80%, and that the need to develop in the snowy mountains. In the city and on the beach is fine degree of darkening does not exceed "2" and "3" respectively.

Under the protection of

How do you know what glasses you bought to protect against UV?

In appearance nothing can not be determined. But we can trust the manufacturer. If the mark is glasses UV 400 such points can safely buy. Abbreviation UV means ultraviolet radiation. 400 - indicates that lenses made so that not transmit light with a wavelength of 400 nanometers. UV 600 - marking, which put on professional glasses (mining, for surfers), which are necessary where the active insolation, t. E. The wavelength of light more. If the figure is less than 400 - this means: radiation protection is not complete.

What would a manufacturer or write correctly to check the protective capacity points from ultraviolet radiation by a special device - spectrophotometer (UV detector). It can be found in good optics. The procedure takes a few seconds.

Who is that?

Chameleon. Photochromic lenses change their degree of darkening depending on the lighting. In the sun darken the room are transparent. This is convenient for those who wear vision glasses every time it is not necessary to remove them when you go home from the street.

Quality features - electric lighting does not cause discoloration.

Another caveat: the windshield domestic cars do not usually have UV protection and photochromic glasses in the cabin darken. On the windshield of cars most of the protective film is applied from the radiation, and photochromic glasses in their interior will remain light.

The polarization properties of glasses. Drivers are useful to pay attention to such property points. With the polarization removed glare from wet surfaces: water, asphalt; Flash lights perceived softer.
Polarization is similar to the effect of blinds: are rays coming in the same direction.

Does this property lay in your glasses, you can check this: if you cross two pairs of polarized glasses, the glass overlay area will be completely dark.

Elevated intraocular pressure. It is better to choose a mild shade or clear lenses, which have UV protection. But it is not dark! In the dark lenses of the pupil expands strongly, it causes deterioration of the outflow of intraocular fluid and increased intraocular pressure.

Glaucoma. It is necessary to use special glasses with lenses green, and a degree of shade that does not cause a strong pupil dilation. These therapeutic glasses are made individually to order. If you see such complete "glasses glaucoma" on a tray store - you "divorce"!

Myopia, hyperopia, retinal disease, age-related decline in visual acuity. In these cases, more comfortable lens browns, yellows. They enhance contrast and clarity.

Some people should not even think twice whether to buy high-quality glasses with reliable protection from UV rays.

Sunglasses should be worn on a sunny day, if you have one of these problems.

Dry eye syndrome.   Excess UV further dries the tear film, and can burn the cornea.

Cataracts.   UV rays aggravates began clouding of the lens, accelerates disease progression.

The best - to children!

In children, the pupils wider and clearer lens than adults, so they are more vulnerable to excessive UV. In addition, children have traditionally been more to be outdoors. But their physiological status protects the eye: deep planting, eyebrows, eyelashes big, strong ability to squint. If a child has vision glasses, they already have UV protection - is laid in the manufacture of children's lenses.

Children's sunglasses - rather whim parents. In the city and on the beach in the morning to protect your eyes enough to wear a cap with a peak child. But for a trip to a ski resort or to Egypt will need good quality sunglasses. They are selected on the same principle as that of the adults: plastic, protection from UV (UV 600 or 400), the degree of darkening - the above "2".

Personal opinion

Arina Sharapova

Journalist, TV presenter

- It is important that sunglasses fit to face. Recently, I pay attention to the glass, I need so they do not scratch or blikovat because I often shoot in the street. Naturally, I buy glasses only recognized firms and to firms that do not specialize in such production, but still produce glasses, treat with suspicion.

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