About sunglasses, you should know the 'cold' knowledge

u003cbru003eIt's the scorching summer again. In the hot sun, a pair of fashionable glasses.com/sunglasses-1.html' target='_blank'>sunglasses can not only block the strong sunlight, but also a concave shape weapon. Many fashion people believe that summer without sunglasses is not complete. Nowadays, there are many different kinds of sunglasses available on the market, but on the other hand, many people have found that some sunglasses feel very dark when worn, and it is a bit difficult to look at the road. Sometimes I feel pain in my eyes, wear it for a long time, and even feel dizzy. Obviously, the reason lies in the quality of the glasses. Recommended reading: Why are sunglasses so hot forever? That’s right, today I don’t talk about how to choose sunglasses according to the face shape, nor what kind of frame is the most fashionable. Instead, I’m going to talk about the 'cold knowledge' about sunglasses. Not only do we welcome friends who often wear sunglasses to come and watch, especially glasses. Manufacturers need to understand the following. First of all, let's talk about the real purpose of wearing sunglasses-certainly not for the concave shape, but to prevent eye diseases! 1. The main function of sunglasses is to filter ultraviolet rays. Excessive ultraviolet (UV) exposure in the sun may cause cataracts, eyelid skin cancer and electro-optic ophthalmia diseases. Even if you wear a hat with a wide brim, it can only block about 50% of the ultraviolet rays from reaching your eyes. Therefore, it is necessary to wear sunglasses when the sun is strong. 2. Sunglasses can filter short-wavelength blue light. Studies have found that long-term exposure to ultraviolet light and short-wavelength blue light is a risk factor leading to the onset of age-related macular variants. 3. In summer, wearing sunglasses can reduce the adjustment burden of the eye's ciliary muscle under strong light, so that the eyes can look at objects comfortably under natural light. Of course, sunglasses can play such an important protective role for our eyes, there is a crucial prerequisite, that is-qualified quality. At present, the main problem with inferior sunglasses on the market is the unqualified transmittance of the ultraviolet spectrum, which means that too much ultraviolet light is transmitted, which cannot block the ultraviolet light. In addition, there are too large axial deviation and excessive horizontal deviation of the optical center. These two test indicators are unqualified, which are the main reasons for blurred vision and eye fatigue. In fact, our country has strict testing standards for the quality requirements of glasses-related products. For different testing items, there are 'National Basic Safety Technical Specifications for Glasses ProductsThere is GB/T14214-2003 'Spectacle Frames-General Requirements and Test Methods'. In addition, QB2457-1999 'SunglassesThe inspection content mainly includes the surface quality and internal defects, the optical performance of the lens (vertical power, prism power), frame requirements, assembly accuracy and shaping requirements, and transmission characteristics. Related Reading: Fashion Sunglasses Sunglasses
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