1. The human body has an instinctual response to self-protection. When the eyes encounter strong light, the pupils will naturally become smaller, reducing the UV energy entering the eyes. Once you wear glasses without UV protection, the pupils will be enlarged, plus this This kind of glasses does not isolate ultraviolet rays. At this moment, the eyes are equivalent to the wide opening of the portal. If the ultraviolet rays enter, the damage to the eyes can be imagined.

2. Sunglasses can block ultraviolet rays because a special coating film is added to the lenses. Inferior sunglasses not only cannot block ultraviolet rays, but also seriously reduce the transmittance of the lenses, making the pupils larger, and the ultraviolet rays will be injected in large quantities. Eye damage. In addition, inferior lenses can cause visual fatigue such as nausea, forgetfulness, and insomnia.

3. The color of the sunglasses is light gray, brown or light smoke, followed by green, amber, blue, etc. Red is only used for sunbathing or snow.

4. Polarized sunglasses are best used in cars, because they can reduce glare.

5. If you can see your eyes very clearly after putting on your sunglasses, then your lens is too light.

6. When the sun goes down, it is best to remove the sunglasses, otherwise, our eyesight will be affected in the place with weak light.

7, should go to the regular glasses shop to choose regular manufacturers of sunglasses with anti-ultraviolet function.

8. Pay attention to the lens surface when selecting.

9. When buying sunglasses, you can judge according to whether the vision is clear. To buy high-quality sunglasses, the only thing that can be done is to buy sunglasses at professional optics shops and regular eyewear shops.