Walking on a hot summer day along the street, a person meets hundreds of passers-by wearing sunglasses. Some do it for fashion, others for health. Sometimes people do not even realize how useful sunglasses can be, and how important it is to choose the right model.
The latter may seem like a rather difficult task, but everything is much simpler than it seems. You can verify this by clicking on the link.
What is the use of sunglasses?
The ultraviolet rays of the sun are harmful to the eye. They penetrate directly into the visual organ and can adversely affect the retina and lens. That is why doctors recommend wearing safety glasses in sunny weather or on cold days when there is a layer of snow on the street. Dark lenses trap ultraviolet rays, which is why less harmful light gets into the eye.
Sunglasses also help people who find it hard to look at bright colors. They experience increased discomfort in sunny weather, as it pains them to look at the light and bright objects. The darkened lenses make the glare not so bright, and a person can look at it without discomfort.
How to choose glasses?
Scientists from the USA have proved that ultraviolet rays are most effectively absorbed by glasses with curved lenses. Therefore, when choosing an accessory, it is necessary to select exactly this form.
The next parameter by which points are selected is the degree of dimming. It must be selected based on eye sensitivity.The dimming value can vary from 25% to 100%. The higher the score, the darker the lens will be.
To make the glass less scratched, you need to choose models from polycarbonate plastic. It retains ultraviolet well and does not deteriorate from contact with sharp objects. This is especially true if a person has the habit of putting an accessory in a bag with other items.
After determining with practical characteristics, you can choose the appearance and color of the frame and glasses.
Interesting fact: Most often, glasses for sunglasses are made black, gray, green and amber. However, color does not affect the containment of ultraviolet rays and eye protection. These characteristics depend solely on the characteristics of the glass.
Sunglasses are useful because they prevent the penetration of ultraviolet sunlight into the eye. They are also worn by people whose eyes are sensitive to bright colors. The model of glasses is selected according to the type of glass, shape, as well as the degree of blackout.
