Sunglasses UV400
What does sunglasses UV400 mean?
UV400: The average transmittance of the lens through which ultraviolet rays with a wavelength below 400nm penetrate is not greater than 2%.
Sunlight can be divided into ultraviolet (UV) (100-400nm), visible light (400-800nm), and infrared (IR) (above 800nm) according to its wavelength. Among them, the ultraviolet rays in the 315-400nm range are called ultraviolet A, which is one of the causes of cataracts; The 280-315nm section, also known as ultraviolet B, is one of the causes of acute corneal conjunctivitis; UV C below 280nm is extremely harmful to the growth and development of animals and plants on Earth. Fortunately, the vast majority is filtered out by the ozone layer. In recent years, with the deterioration of the Earth's living environment, the ozone layer has been destroyed, and the whitening of ultraviolet C has also attracted people's attention.
The function of sunglasses UV400:
UV400 refers to the UV resistance coefficient, and UV400 lenses are the type of lenses with the best UV resistance coefficient. Compared to other types, they are the lenses with the highest UV resistance coefficient. People often say that polarized lenses have a high UV resistance coefficient, but they mainly prevent strong light and glare. If you want 100% UV protection, UV400 lenses are the best and highest. Wearing UV400 lenses is better for regular outdoor activities such as fishing, skiing, and driving.
UV400 lenses can 100% block invisible ultraviolet rays, which is its greatest function. Simply put, it is the ability to control the transmittance of light with wavelengths of 400nm and below within 5%, reducing ultraviolet radiation and protecting people from eye diseases such as cataracts, conjunctival macular degeneration, and retinitis. Some specially added hardening and dust prevention systems not only improve visual clarity, but also increase the service life of the lens, as well as significantly improve the hardness of the lens and resist scratches.
Precautions for wearing sunglasses:
1. The human body has an instinctive response to self-protection. When the eyes encounter strong light, the pupils will naturally shrink, reducing the amount of ultraviolet energy entering the eyes. Once wearing glasses without UV protection function, it will cause the pupils to enlarge. In addition, these glasses do not have the effect of isolating ultraviolet rays. At this time, the eyes are like a wide open door, allowing ultraviolet rays to enter, the harm to the eyes can be imagined.
2. Sunglasses can block ultraviolet rays because a special coating is added to the lenses, while low-quality sunglasses not only cannot block ultraviolet rays, but also seriously reduce the transparency of the lenses, causing the pupils to become larger, causing a large amount of ultraviolet rays to penetrate and damage the eyes. In addition, inferior lenses can also cause visual fatigue symptoms such as nausea, forgetfulness, and insomnia.
3. The color of the sunglasses is superior to light gray, brown, or light smoke, followed by green, amber, blue, etc., and red is only used for sunbathing or snow.
4. It is best to use polarized sunglasses when riding in a car, because they can reduce the glare.
5. If you wear sunglasses and others can see your eyes very clearly, then your lenses are too light.
6. When the sun goes down, it's better to remove sunglasses, otherwise, our eyesight will be affected in places with weak light.
Where is a good place to buy sunglasses?
It should be noted that the cheap so-called "top brand" sunglasses sold by some small shops, stalls and night markets are not worthy of the name, and the lenses are often poorly made and have poor optical performance. The material is not made of one-time stamped resin, but rather recycled materials, and even cheaper plastics of inferior quality are used. This kind of sunglasses has almost no function of shielding ultraviolet rays, and its optical performance is extremely poor. It is common that the prism degree and vertex power exceed the standard. Wearing it for a long time can cause eye strain and also lead to dizziness. Not only does it not provide visual protection, but it can also harm the eyes. If driving or exercising outdoors, it can also endanger the personal safety of the wearer. In addition, these merchants often lack credibility protection or mobile sales, and once problems arise, they have no way to protect their rights. Therefore, please pay attention to selecting regular manufacturers and regular stores when you buy sunglasses, so as to protect your own interests from infringement.
Thanks for reading
Sophie Yang
004@mikeeyewear.com
