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U
ltra-violet radiation:
consists of two ranges:
- UV-A (320-380 nm) (rays А)
- UV-B (290-320 nm) (rays В)
- UV-С (200-290 nm) (rays С)
The most dangerous are А, rays, which are able to penetrate
deeply and provoke different diseases.
А rays may cause snow blindness, as the reflected rays are
more dangerous for eyes (there is weaker protectiveness in the lower segment of an eye).
В rays influence the skin surface and cause sunburn.
С rays detain ozone layer.
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What goggles to choose:
As you know, there are two types of goggles: with glass and plastic lens.
Glass doesn't let ultra-violet rays through, even
if it is not darkened.
That's why any goggles with glass lens will protect your eyes from ultra-violet
rays. Besides, it is more difficult to scratch the glass than the plastic. But
on the other hand they are heavy and not safe. In case of them being broken
the pieces will get into your eyes. It is simpler, as well as more difficult, with
plastic lens. They cannot be broken and are twice lighter than glass ones.
But not all plastic lens are able to protect your eyes from
harmful rays!
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How can you come to know about it?
You should have a look on the label, and if it has the inscription
"Blocks at least 95% UV-B and 60% UV-A"
it means that these goggles don't let 95% of B ultra-violet rays and 60 %
A ultra-violet rays through. If there is no label, then it is simply darkened
plastic goggles which cannot protect your eyes from ultra-violet rays.
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VERY IMPORTANT!!!
It is more dangerous to wear plastic darkened goggles, which do not absorb ultra-violet rays,
than even to have no goggles at all. The point is that a simple darkening which they create deceive
your pupil and it doesn't narrow. So, the load on your eyes increases. In the course of time it may
cause the clouding of the crystalline lens and weaken your eye-sight. And these are not jokes already.
If you have any questions about the equipment you want to take with you,
you can contact us and get a profound consultation on this question.
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