defenestraethe

A pair of good quality sunglasses protects the eyes not only from the glare but also from the UV radiation. The bright light reduces the clarity of vision, tires the eyes and can cause headaches. UV sunlight, which in large quantities can be harmful to many forms of life, is divided into three parts: UV-A, UV-B and UV-C. Like visible light, UV-A and UV-B penetrate the protective atmosphere surrounding the earth and reach the ground. UV-C which contains a particularly high amount of energy and therefore would be extremely harmful, never reaches the surface of the earth. UV-B, with a wavelength of about 400nm, contains a high amount of energy and can cause sunburn. Therefore, sunlight that burns the skin can also injure the various layers of tissue in the eye. UV-A is absorbed by the eyes, but no harmful effects have been reported so far.

Our essential ally in protecting the health of our eyes are sunglasses and especially sunglasses lenses. Look for glasses whose lenses absorb 98% - 100% of the harmful radiation and are labeled "UV 400".

The types of lenses

Polarized lenses. Polarized lenses are based on the principle of polarization of light. They have very good UV absorption, neutralize the glare of the light and provide a relaxing look. If you love sea and snow sports or drive frequently, choose the best sunglasses for driving.

• Mirror / mirror lenses. Exterior mirror-coated lenses reflect much of the radiation, significantly reducing the amount of light reaching the eye.
• Blue-blockers. These lenses absorb the light in blue-violet light, that is, more than the spectrum of ultraviolet rays, and thus protect them better than just absorbent sunglasses. If you prefer sailing, skiing or racing, you are a pilot or hunter, prefer them.
• Gradient darkness / degrade lenses. The lenses have a dark upper section that gradually decreases, resulting in an open lower section. They are ideal for everyday and demanding driving.
• Photochromic lenses. These are lenses that increase their darkness, depending on the amount of sunlight they receive. So you can have dark sunglasses under the bright sun and white, clear glasses when you are moving indoors. If everyday life dictates frequent indoor and outdoor changes, they are ideal!

The material of the lenses

Sunglasses are made of crystal, organic matter or polycarbonate. Because crystals are light weight, limited in color and can break, they are now used less frequently by sunglasses manufacturers. In contrast to the unlimited paint and shade capabilities, low weight and safety have made organic sunglasses a top choice for manufacturers. For children as well as those who strain their glasses, organic lenses with high resistance to breakage or polycarbonate that are 50 times more resistant to shock and surface abrasion than organic lenses should be selected.

The color of the lenses

You can choose any color you prefer for your glasses lenses. Your choice does not affect the effectiveness of lens protection at all. In general, gray and brown are the most popular, as they are less likely to change the colors of the environment. Coffee additionally increases the brightness. For some special uses, there are colors that will be preferred over others, such as yellow for shooting, hunting and night driving, as it increases the contrast of colors.