have become a necessity for people to travel, but many people do not pay attention to the choice of sunglasses, and do not know how to choose sunglasses. In fact, there are certain skills in the choice of sunglasses. Ray-Ban RB4221-F Men's Sunglasses 6170/55 Blue 1. Don't choose sunglasses that are not UV-resistant. Buy a pair of sunglasses at a roadside shop and enjoy yourself? Those inferior sunglasses that are not UV-resistant are better not to wear. Wearing sunglasses is to prevent the damage of light and ultraviolet rays to the eyes. Firstly, shading can prevent headaches caused by dazzling light; secondly, if the ultraviolet rays in the sun enter the retina, it will cause macular degeneration and even cataracts and other eye diseases. Inferior sunglasses only use colored lenses to block the light. Human pupils will naturally enlarge in low light. However, inferior sunglasses lenses do not have the function of preventing ultraviolet rays. Instead, the enlarged pupils will absorb more ultraviolet rays, which can easily cause cataracts. Solar keratitis, corneal endothelial damage and macular degeneration of the eye and other diseases. 2. The color of sunglasses is preferably dark gray. Wearing glasses with too dark color will make the eyes in a darkroom environment. The pupils of human eyes will automatically expand in a dark environment, and long-term pupil expansion can easily lead to glaucoma and other diseases. Therefore, dark gray is the best choice for sunglasses, followed by dark brown and black, and blue and purple are inferior, because these two kinds of lenses will transmit more ultraviolet rays. Try not to use yellow, orange and light red. YC9703 Ladies Sunglasses C5 White Frame Black Leg/Gray 3. The lens of the sunglasses should be smooth and free of wear marks. When choosing lenses, pay attention to the surface of the lenses. They should be smooth and free of wear marks and bubbles. Place the lenses flat and look at the lenses from a horizontal direction. No warpage. You can take the sunglasses 45 cm away from your eyes, observe the vertical and horizontal lines around you through the glasses, such as window frames or door frames, and then move the glasses up and down. If the straight line is distorted or oscillated, it means that the lens is deformed and should not be purchased. Lenses that are uneven or have marks or bubbles will cause discomfort such as dizziness after wearing them, so they are not suitable for purchase. 4. How to prevent sunglasses syndrome. syndrome refers to long-term wearing of sunglasses, resulting in decreased vision and blurred vision. In severe cases, symptoms such as headache, dizziness, vertigo, and inability to see for a long time can occur. This symptom is manifested in a variety of discomforts, such as obvious numbness and tingling in the eyes near the nose in the early stage, and the symptoms are more obvious when breathing, much like a cold, and some people feel like a small bug crawling on the face. Walking, the upper jaw gums are numb, the upper incisors feel uncomfortable, and the local blood circulation is not smooth, causing skin inflammation, eye swelling, and vision loss. These discomforts usually appear after 2-3 weeks of wearing sunglasses. To prevent sunglasses syndrome, first of all, we must choose and use sunglasses properly. Choose glasses with the same distance between the pupils and the shape of your face. In addition, do not wear large sunglasses as much as possible. When you must wear them, you must shorten the time to wear the glasses. After removing the glasses, use your fingers to massage 10-20 times along the sides of the eyes and nose. Once sunglasses syndrome occurs, you should stop wearing sunglasses immediately. Related Reading: Sunglasses and Sunglasses
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