Many people who choose sunglasses focus on choosing whether they are face-shape or trendy, ignoring the important criterion of a sunglasses that protects their eyes from the dazzling summer sun.
People often focus maximum on skin protection with sunscreen and layers of sun protection hats; but neglect to protect the eyes from the negative harmful effects of UV rays every time I go out. Still know that sunglasses are also one of the indispensable accessories to avoid glare, dazzling when you need to go out when it’s hot. Many people who choose sunglasses focus on choosing the style of the glasses, whether the glasses are the face shape or the trendy, without ignoring the important criterion of a sunglasses before the blazing summer sun.
Your cornea will have to absorb most of the UV radiation when exposed to sunlight, causing cataracts or macular degeneration, keratitis, corneal keratocytes … many Eye diseases can arise with the negative impact of UV rays. Especially the days UV rays are as dangerous as they are now . 
Sunglasses are not merely a fashion accessory but also a protective item for the eyes. Therefore, choosing the right glasses is extremely important to keep your eyes safe. You need to pay special attention to this index on the glass to choose the most effective UV protection. 
Standard UV resistant sunglasses UV400 glass is recognized as having the highest UV protection standards. With the ability to block radiant light rays with a wavelength up to 400 nanometers. This standard is considered quite high and strict for maximum UV protection for your eyes when going in the sun. 
Wholesale Assorted Colors Metal UV400 Square Aviator Fashion Sunglasses Womens Bulk. 
From the ability to protect eyes from dust, smoke and solar radiation, when choosing UV400 glasses, you should pay attention to choosing glasses according to the following standards: * According to Australian standard AS 1067 . Sunglasses are divided into 5 categories, from UV filter category 0 to UV filter category 4, based on the amount of light the glasses absorb. UV filter category 0 has the least ability to block UV rays and sunlight. UV filter category 04 has the best level of protection. * The US standard is ANSI Z80.3-1972 . Under this type of standard, lenses should be able to keep UVB rays no more than 1% and UVA rays no more than 0.5 times that of visible light. * The European standard is EN 1836: 2005 . According to this type of standard, the UV filter category 0 is the glass that does not block UV at the necessary level, the UV filter category 1 is sufficient, the UV filter category 2 is the good compartment, and the UV filter category 3 is the complete compartment. 
The standard size for a UV-protective eyewear according to European standards is EN 1836: 2005. The material of the sunglasses resists UV rays In the old days, sunglasses were simply made of glass. But today, most of the better, more durable lenses are made of plastic because it filters ultraviolet rays. This special plastic, called polycarbonate, is capable of withstanding strong bumps. 
There is a special type of glass called high index (more clearly high index of refraction, meaning high index of refraction) that is resistant to large amounts of ultraviolet radiation and also thinner glass thickness. In addition, there are also reflective mirror lenses on the market. This type has good light blocking ability but is not effective against UV rays. Note – Choose sunglasses with large lenses that fit perfectly to your face, and wrap around your eyes to better block out the sun. – Never look directly at the sun, even when wearing sunglasses to avoid chronic eye diseases. – Some types of contact lenses are also UV resistant but do not cover the eyes. So, you should still use sunglasses for full protection.
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