Tip 1: What to look for when buying sun glasses
Tip 1: What to look for when buying sun glasses
On the approach of warm days and the sun will begin to dazzleeyes, therefore, it's time to think about buying glasses from the sun. But not many people know that when buying sunglasses you need to pay attention not only to the shape of the frame, but also to the characteristics of the lenses. After all, the main task of glasses from the sun, this is protection from ultraviolet radiation.
Sunglasses lenses are made of plastic or glass. Both options have their pros and cons.
Lenses from plastic very light, it is almost impossible to break them. But they are more susceptible to mechanical damage, such as scratches. If you carry them in a purse without a case, they will quickly become unusable.
To increase the protective properties of plastic lenses, special filters are used, which greatly increase the price of glasses. That is, the more serious the defense, the higher the price.
Glass lenses heavier than plastic, but they are not coveredscratches with careless handling. This material itself cuts off part of the ultraviolet rays, so even glass with minimal shading have protective properties.
However, it must be remembered that glass is very traumatic. If such glasses are broken, small fragments can not be avoided.
Color also plays an important role. The most comfortable for the eyes are dark gray and dark brown. They retain the natural perception of colors and are able to filter out much more ultraviolet rays.
But blue and blue lenses are not recommended. The blue color of the lens stimulates the dilatation of the pupils, which can provoke a retinal burn.
Glasses with blue lenses violate the perception of colors and therefore they are not particularly recommended to drivers.
But yellow lenses, on the contrary, increase the contrast and help to see even in cloudy weather.
Chameleon glasses change color. In the sun, such glasses will be dark, and in the room transparent. Such glasses are very popular among drivers, as well as people with visual impairment.
However, over time, these glasses react to lenses and therefore they often have to be changed.
Tip 2: The right purchase of sunglasses
With the onset of spring and summer, our skin and ourthe eyes begin to feel more and more sunlight. If you do not protect yourself from them, then the aging of the skin begins, especially around the eyes. To avoid this, you need to wear sunglasses.
Let's try to figure out which glasses you need.
Ultraviolet radiation. The sun's rays that affect your skin produce a harmful effect on it. In small doses, they are useful because they supply your body with vitamin D. In high doses, the sun's rays can cause wrinkles and even skin cancer. Overabundance of ultraviolet rays can damage the shell of the eyes and even lead to blindness. Therefore, the purchase of sunglasses is simply necessary.
How to buy sunglasses
When buying glasses, pay attention, is there anytheir marking, indicating that they protect against ultraviolet rays. If there is no such marking, then buying these points is a waste of money. Also important is the shape of the glasses. Their upper line should coincide with the eyebrows. In this case, they will close your eyes and the space around them.
Factors that play a value in the selection of points:
- Width of the face;
- Length of eyelashes. People with long eyelashes will be uncomfortable if the glasses are placed too close to the eyelids;
- The width of the bridge of the nose. If the glasses are not selected correctly, the jumper will be too wide or too narrow;
- Diameter of the lens, or diagonal. This is the distance from the right upper corner to the lower left;
- Country of origin. You need to know from which country your points are. It is known that the highest quality glasses are produced in the US and Italy;
- Rim. She must steadily hold the lens and fit tightly to your face.
Materials from which the frame is made
There are many materials from which you can choose. Metal makes strong and, at the same time, non-severe frames. Usually they use nickel, aluminum, stainless steel. There are many options for plastic frames. They are light and inexpensive, but, at the same time, fragile. Nylon is often mixed with other types of polymers, and very good and quality frames are made from it. Lenses can be made of acrylic, in this case, they are stable and inexpensive. Glass lenses have excellent optical quality, but they are heavier, and can break. Glass lenses are not recommended for outdoor use.
