In the previous article, we discussed “How do I choose sunglasses?”. In this article, let’s talk about “Is it bad to wear non-polarized sunglasses?”.
Ultraviolet light is invisible from 200nm to 380nm, of which 200nm to 280nm is UVC, 280nm to 315nm is UVB and 315nm to 380nm is UVA. The shorter the wavelength, the greater the damage. ?However, the short-wave UVC is almost completely blocked by the ozone layer, and the ultraviolet rays we are most exposed to in daily life are UVA and UVB. The strong and large amount of ultraviolet light will cause acute ocular surface injury such as optical keratitis, but the acute injury recovery is fast and has no sequela. Long-term exposure to UV rays can cause chronic damage such as pterygium and cataracts, which can be severe and even cause permanent vision damage. ?Cataracts are visual disturbances caused by the opacity of the lens. ?Our normal lens is clear, transparent, but after metamorphism, the lens is milky white, not clear, so to prevent the reflection of ultraviolet light after the surface, a lot of non -polarized sunglasses manufacturers will plate film after the surface of the sunglasses so that they can more comprehensively protect from ultraviolet damage to the human eye.
Flying Dust Prevention
The road is very dusty, so a walk on the road and dust will charm the eyes. Very uncomfortable, it will make people's mood very bad, and the sunglasses have certain functions to prevent the dust from entering the eyes. They can protect the eyes from sandstorm damage. The sunglasses can cope with the general sandstorm.
To prevent the Exposure of Strong Light
When the eye receives too much light, it naturally contracts the iris. ?Once the iris has contracted to its limit, then people need to squint. ?If there is still too much light, such as sunlight reflected off snow, it can damage the retina. ?Sunglasses can filter out up to 97 percent of the light entering the eye to prevent damage. Certain frequencies of light blur the vision. They can eliminate light of a particular frequency. ??
Light color sunglasses are fashionable varieties of shading lenses, although it has the less blocking effect of sunlight than the sunglasses. But its fundamental purpose is decoration, relying on rich color and trendy styles. They are popular with young people, in recent years. The women who like fashion likes using sunglasses to match all kinds of clothing.
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