In the previous article, we discussed “Are polarized sunglasses better for your eyes?”. In this article, let’s talk about “Do polarized sunglasses block UV rays?”.
UV protection is the primary function of sunglasses, but when you're shopping for sunglasses, make sure your sunglasses provide UV protection. In addition, choose sunglasses with polarized and anti-reflective lenses to better protect your eyes and reduce glare.
The Meaning of UV Standard for UV Protection Degree
The human eye's perception of light is 380~780nm (visible light), and ultraviolet light is the wavelength of less than 380nm (visible light). The definition of UV380 is that it can effectively block the wavelength of the light below 380nm. The UV400 standard also blocks some visible light, so it loses some color.
When to wear polarized sunglasses?
Polarized sunglasses are the perfect choice for driving and cycling. When you go fishing or doing water sports, the open water is a very reflective environment that produces intense glare and discomfort. Polarized lenses can help fishermen or water athletes see clearly in an aquatic environment.
Do polarized sunglasses have UV protection?
Polarized sunglasses do provide better image sharpness and reduce light intensity problems, but they may not have full UV protection. While simple polarized lenses can filter out ambient light and glare, but exposure to UVA and UVB rays can increase your risk of developing cataracts and macular degeneration. To protect your eyes, choose sunglasses that block 99 to 0 percent of UVA and UVB rays. Filters 70 to 80 percent of visible light, including infrared light. Although most polarized lenses also have a UV protection function, polarized light alone won't protect your eyes from harmful UV rays. According to the Glaucoma Research Foundation, polarization has nothing to do with UV protection, so you still need to make sure your lenses absorb UV rays.
Tips of Buying Polarized Sunglasses
The main two points are UV (UV protection) and polarized light (polarized light, polarization filter) because only UV protection can better protect the eyes, and the polarized light can let the light is arranged into the same direction of light into the human eye so that the surrounding scenery looks clear and not dazzling.
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