To begin with, let's define what sunglasses are for.
Sunglasses are not just a fashion accessory, they protect the eyes from the merciless rays of the sun.
We all know about UV radiation, which is extremely dangerous for the retina of the eye and can cause complete or partial blindness. UV radiation is divided into two types: UVA and UVB, and UVA rays that penetrate are considered more dangerous in the deeper layers of the skin (dermis) and the eye respectively. They stimulate the production of free radicals, which cause oxidative stress and can lead to indirect DNA damage.
Rays of the second type - UVB - are not so dangerous for the eyes, but with intense exposure they can also affect visual impairment, causing blurring, pain and temporary blindness. The wavelength of these rays is shorter compared to UVA.
In order to protect the eyes and the skin around them, it is extremely important to use glasses that have adequate protection against ultraviolet radiation. By the way, quality sunglasses are also "helpful" for deep wrinkles that often appear on the forehead as a result of squinting of the eyes, which are blinded by the strong sunlight.
And don't be fooled that ultraviolet radiation has a day off! Even in winter it reflects off the snow and causes no less damage to the health of the eyes. The most dangerous trap of UV radiation is cloudy weather, as the clouds serve as a "Trojan horse" for the dangerous rays of the sun and harm unsuspecting, unprotected eyes.
Who needs protective sunglasses?
The answer to this question is very simple. Everyone! And no, it doesn't matter if you are young, beautiful and strong, when you are facing an enemy like the sun you need a serious "weapon".
To find out exactly how much protection your glasses provide, look for markings or inscriptions on the frame of the glasses. For example, if the frame says UV-400, this means that your glasses will provide you with 100% protection from the sun's UV rays. There are also another type of marking, which is indicated by the numbers from 0 to 4, where 0 means 5% protection, and 4 means 95% protection from the sun.
We advise you to buy only good quality glasses, as poor quality glasses are not only unhealthy, but also cause more damage to the eyes because they make the pupils dilated and thus much more unfiltered dangerous light enters.
p>Can the quality of sunglasses be tested at home?
Yes, you can. The only thing you need to do is buy an ultraviolet flashlight. If the light passes through the glasses, then the glasses are fake, and conversely, if the light from the flashlight does not pass through the lenses, it means that you have bought quality sunglasses.
The materials from which glasses are made are usually either glass or plastic, and it is believed that glass glasses are more often equipped with UV protection. In the case of expensive models, of course, the material does not matter, since it is certainly equipped with the necessary filters.
Let us now look at the glasses, only not through the eyes of science but through the eyes of fashion.
To choose the glasses that suit you best, you need to consider the shape of your face.
If you have a round face, then butterfly glasses or models that have a narrow nose bridge will be best for you. Avoid round glasses that are too narrow because they will not suit your face.
>If you have an oval face, we recommend you to buy round or rectangular glasses. Avoid too massive rims.
If your face is square, choose wide glasses, teardrop shaped glasses would also be a good choice. You can also choose some colored frame as it will probably suit you.
If you have a rectangular shape, emphasize eyeglass models that visually expand your face. Here, any large glasses will look good on you. Avoid small models, because this will distort the proportions of your face and you will look ridiculous.
