Sun glasses- fighting with ultra-violet

For the beginning I will remind, that  three types of ultra-violet radiations: UV-A, UV-B and UV-C exist. The type most dangerous to us is B.

It does make a skin sunburn, and at the same time provokes development of new formations. But if the body still though somehow can adapt, producing saving melanin, the eyes are absolutely defenseless - well unless only we will constantly squint: so though influence of radiation somehow decreases, but the amount of wrinkles around the eyes increases.

By the way, even in cloudy weather  up to 80 % of nocuous ultra-violet beams fall to us, and in solar without additional protection to not do without in any way. Therefore doctors recommend all people to use so-called A Pair Of Shades or simply - sunglasses. 

And here that the main advice - is better to not stint, for not regret afterwards.

Buying A Pair Of Shades (https://a-pair-of-shades.pissedconsumer.com/) on the allocations, not certificated, from the unknown manufacturer, you harm to the eyes even more,so do not complain afterwards . The matter is that simply dark glasses do not interfere with penetration of nocuous beams. But at blackout our pupil reflex extends, we do not squint, and it turns out, that in an eye gets even more ultraviolet!

Result - deterioration of sight, turbidity crystalline lens, a burn of a retina. The most widespread disease caused by harmful radiation, - photo-keratitis (defeat of a cornea).

As well as at a solar burn, sensations can be rather painful. Lachrymation, reddening and sensation of sand in the eyes, swollen eyelid, even time loss of sight - all this symptoms photo-keratitis.

Its extreme form - « snow blindness » which climbers and skiers suffer. In this case on restoration of sight some days are required, and watering and the irritation of eyes can remain for ever.

All listed troubles speak well for purchases "correct", instead of false pair of shades.

Thus it is the best way to address in the specialized shops of optics. In fact, all goods there are certificated. And it is completely not necessary to choose expensive brand models. It is possible to get glasses from not so known manufacturers, but of normal quality.

 Which glasses lenses are better? Glass or plastic?

Leading world manufacturers already for a long time have answered this question: today the majority of models are produced from plastic.

First, it is  not so. Second, plastic material  has many advantages: safety, ease, an opportunity of performance of the diversified design and drawing of an additional sheeting (for example, polarizing), well and it is natural - reliable protection from UV-radiations.

Unique lack - this material is faster " wear out " and is scratched. A Pair Of Shades with glass lenses are considered unsafe because of their fragility and do not suit for an active way of life.

Various coverings of lenses matter too

Basically A Pair Of Shades are released with usual protective lenses of various colors. But a lot of  "trendy" coverings has appeared also.

For example, polarizing improves contrast, removes blinding patches of light. Glasses with such lenses especially recommend for drivers.

To check up, whether your model has a polarizing covering (by the way, company Polaroid specializes on it),  is possible in shop of optics with the help of the special screen or a label.

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