Ultraviolet rays aggressive act on the eye, and it
increases the risk of vision problems in the future. Fortunately, reduce the
danger is not so difficult, the main thing to know some nuances.
How to Protect Your Eyes from Ultraviolet Radiation
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| How to protect your eyes from ultraviolet Radiation |
Aggressive rays
Ultraviolet rays have a damaging effect on the eyelids, cornea and lens of the eye. Even short-term exposure to ultraviolet light can cause inflammation of the cornea - photokeratitis. This disease is accompanied by pain, redness, foreign body sensation in the eye, a burning sensation, increased sensitivity to light, and lacrimation. And as long regular exposure to UV radiation can cause serious illness, initially asymptomatic: cataracts, macular degeneration, skin cancer around the eyes.
That is why protecting your eyes from the sun, it is imperative. The most simple and affordable means to do so - wide-brimmed hats, hats with large visor and, of course, sunglasses. Do not neglect them in the summer in the city or in the country, even on a cloudy day. Well, going on holiday to the sea, you just have to take them with you.
Neither hide nor escape
However, the harmful effects of ultraviolet eyes are exposed not only in summer, but in winter, on a clear day, when the sunlight reflected from the surface of the snow drifts. Clean snow to 80% of UV rays. In the mountains the sun is more dangerous than the plain: with increasing altitude in every thousand meters the intensity of UV radiation increases by 10-12%.
The dry beach sand seems to be more harmless than the snow: it reflects only 15-20% of UV rays. Sea wave - up to 10-30%. But the summer sun is much more aggressive, and therefore a danger to the eye is higher than in winter.
By the way, in the resort from the summer sun does not get to hide even under water. At a depth of about half the intensity of UV rays by about 60% lower than the surface of the sea or the river, but still they are to reach.
It is important to know that the intensity of UV radiation varies during the day: the higher the sun in the sky, the greater the level of radiation. That is why from 12 to 16 hours is particularly harmful to sunbathe, because you can get a sunburn. But if before and after this period, the skin suffers much less with the eyes it's different. Japanese medical studies have shown that the effect of UV rays on the authority of more in the morning and in the afternoon, not in the afternoon. Eyes suffer more when the sun shines on their level and not when it is at its zenith.
Double barrier
Ultraviolet rays are dangerous for any eyes, and yet there are those for whom they are the most harmful. From the bright sun primarily affects children, the elderly, patients who underwent surgery on the retina or the cornea (e.g, laser vision correction) and all blue-eyed and fair-haired people. For them, summer sunglasses - must-have accessory.
And for those who because of vision problems (myopia, astigmatism, farsightedness) to wear corrective glasses, ophthalmologists recommend the use of two levels of protection. In addition to sunglasses - and even contact lenses with UV. The fact is that if the points do not seal tightly to the face, the UV rays are reflected from grass, water, snow, sand, seep over the rim on the sides or the bottom. Such peripheral and reflected rays falling on the cornea, causing even more damage than direct. Contact lens having a UV filter provides an additional barrier. But of course, if for some reason you can not wear lenses, without them you can. Today there is an opportunity to purchase vision glasses, glasses are coated with a layer that protects against ultraviolet radiation.
Choose
"I'm going?" And "How much?" - These two questions are usually asked by people deciding to buy sunglasses. Of course, the design of this fashion accessory has a value, but still its main function - reliable protection of the eyes from ultraviolet radiation. Therefore, in the first such glasses should meet the other criteria. In particular, it is necessary that they:
- Weakened the visible light to a comfortable feeling;
- Further weakening the light blue band, the most dangerous to the retina;
- Blocking ultraviolet light;
- Not too distorted colors, such as do not interfere distinguish between red and green traffic light.
All sunglasses are divided into three main groups:
Cosmetics (Cosmetic) - hardly protect the eyes, it is just a fashion accessory.
Ordinary (General) - this summer the lens meets the requirements of the middle band.
Glasses high degree of protection (High UV-Protection) - for the high mountains and polar regions, equatorial-tropical regions conditions and ozone anomalies.
Well detain light stream only lenses, classic colors: dark blue, black, dark brown. The bright glass, red (pink) and green, even if you have less schurites sun, operate primarily decorative function. Yellow glass recommends athletes: these glasses removed excessive eye strain due to the fact that increases the contrast of the image.
And another thing: quality sunglasses by definition can not be cheap and sold in a stall in the underpass.
