Eyes like ears - one will not grow. If you are still meeting a new summer season without dark glasses or are not sure that your high-quality, read how to choose glasses so that there is no painfully hurt from sunlight.
Content
- Glass or plastic?
- The degree of dimming and shade of lenses
- Polarization and photochrom
- Form of glasses
- If you need diopter
- Individual factors for selection of sunglasses
Sunscreen advertising screams that most importantly — Fashionable brand. Do not believe! Dear cool stamp store does not guarantee you complete retina from the sun. Why do we need trend glasses if they miss ultraviolet and help you to go blind?
But do not be scared: we will tell you how to choose such sunglasses that will take care of your vision and become an indispensable summer friend.
Glass or plastic?
Adherents of tested materials are chosen glass. In his defense — Important fact: with proper coloring it is able to completely block the ultraviolet, not missing the percentage of harmful radiation to the eyes. However, glass is heavier plastic, and in the event of a fall or damage to lenses may be very dangerous.
Plastic (polycarbonate) are now able to do close by protective properties to glass. It is much easier and in combination with a lightweight rim will not be completely felt on the face.
The degree of dimming and shade of lenses
Many believe that the darker lenses, the better they protect from the sun. However, the decrease in the brightness of sunlight in itself does not mean that the glasses save you from radiation. Moreover, incorrectly colored lenses are able to help UV rays penetrate the eye.
You have seen many times how pupils are expanding in the twilight, increasing the surface area to collect more light and distinguish objects. The same happens behind the glass glasses. If the lenses do not have a UV enclosing parameter, the sun burns green light, they say, pass, expensive, carrying destruction.
The documentation of high-quality sunglasses should be indicated how good the lenses will protect your eyes from ultraviolet. Protection in the range from 70 percent is quite sufficient. Of course, the closer the number to the hundred, the better.
The same parameter can be expressed by an unequivocal number.
«4» — Lenses are designed for highlands and for long stay in the area of the equator.
«3» — You are shown an ordinary beach holiday, be it on the latitude of the Mediterranean countries or in our lane.
«2» — Glasses are used in urban conditions in the summer.
«one» — Glasses are designed for wearing other seasons in the city.
«0» — extremely low protection against ultraviolet, such glasses are intended except to reduce discomfort in the sun, but not to protect the eyes from poisonous radiation.
As for color, choose based on your purposes:
- Gray and green can be worn everywhere, they do not distort the colors of the surrounding world;
- Mirrings perfectly reflect the light and are recommended for large heights;
- Golden yellow good for intolery, cloudy weather.
Polarization and photochrom
Polarization lenses are designed to protect the eyes from the reflected light — If there is a lot of snow, water or even shiny wet asphalt. These lenses are directly shown to everyone who is hardly in the sun, drivers, avid beachfronts and surfers, skiers and people who survived the eye operation.
Photochromic lenses — Hamieleon lenses. They react to ultraviolet, changing from full transparency to a rather deep blackout. They are recommended to those who have been carrying out the wheel in the dark (reduce contrast when moving between very dark zones and brightly illuminated areas of the path). In addition, photochromic lenses will like those who are lazy and underwear to carry a replaceable pair of glasses.
Form of glasses
Point shape is usually selected under the features of the face. Small — Small glasses, large — Massive. However, there are also their nuances. The more glasses, the better they protect their eyes from the Sun from all sides. Convex lenses of sports or semi-self-style perfectly close eyes from the sides, but may not like those who prefer, for example, classic style in clothes.
If you need diopter
If you have myopia, hyperopia or any other violation of vision, you will have to make glasses to order. Only if «minus» or «a plus» In both eyes you have the same, you can buy ready-made glasses. But trying about the glasses carefully ordinary: there should be no slightest distortion or discomfort. It is better to first consult with an ophthalmologist, since almost every optics now has its own regular specialist.
Individual factors for selection of sunglasses
- Choosing a frame, turn it in your hands, check how easy it is to fold, whether the connecting screws are hidden.
- You must be comfortable in glasses. Housings are ideally not felt and all the more pressure, nasal stops are also not perceived as a hindrance.
- Watch out how glasses behave if you are sharply leaning or turn your head. They should not hang out and fly.
- If you constantly take some medicines, find out from your doctor if they do not affect the ultraviolet susceptibility.
- Remember that if you are going to stay in the sun from noon to four in the evening, you need glasses with maximum UV protection, since the day sun is the most aggressive.
