Does Polarized Glasses Prevent Ultraviolet Ray?
1.Does polarized glasses prevent ultraviolet ray
Polarizing mirror can prevent ultraviolet rays, but the ability to protect is weak.
The primary function of polarized sunglasses is to prevent UV rays and filter polarized light. A good polarized sunglasses lens can block more than 90% of the penetration of UV rays.Polarised sunglasses with the "UV400" best UV blocking logo offer the best UV protection.
Polarizer is a lens made according to the principle of the polarization of light, which can eliminate and filter the scattered light in the beam, prevent ultraviolet light and filter the polarized light.A good polarizer can achieve the color of the surrounding environment is not distorted, the edge of the object is clear, can effectively distinguish different color lights, reduce the effect of ultraviolet light into the pupil.
Polarizing mirror is like a shutter, just shielded part of the light, and still release basically parallel to the polarization Angle of light (including ultraviolet), shielding rate is less than 50%, from the protection point of view, equivalent to the window to add a layer of soft yarn, just part of the block.The biggest benefit of polarizers is that they block the interference of glare and make the visual effect clearer, while the protection against UV rays is not as good as that of reflective sunglasses and color mirrors.
2.How to judge whether polarized sunglasses have UV protection function
1. Read the label
UV-proof sunglasses labels or lenses can see obvious labels such as "UV-proof", "UV400" and so on.The "UV index," or how well UV rays are filtered, is an important criterion when buying sunglasses.Light with a wavelength between 286nm and 400nm is called ultraviolet light, and generally a 100% UV index is impossible. Most sunglasses have a UV index between 96% and 98%.
Have the sunglass that prevents ultraviolet function, have the following a few kinds of explicit show means commonly:
(1) Labels "UV400" : This means that the cutoff wavelength of the lens to UV is 400nm, that is, its maximum spectral transmission ratio τ Max (λ) is not more than 2% at the wavelength (λ) below 400nm.
(2) Labels "UV" and "UV protection" : This means that the cutoff wavelength of the lens to UV is 380nm, that is, its maximum spectral transmission ratio τ Max (λ) is not more than 2% at the wavelength (λ) below 380nm.
(3) Labeled "100%UV absorption" : this means that the lens has the function of 100% absorption of ultraviolet light, that is, its average transmission ratio in the ultraviolet range is not more than 0.5%.
Achieve the sunglass of aforesaid requirement, just be the sunglass that has protective function to ultraviolet ray on true meaning.
2. Use banknote + banknote pen to verify
Without equipment, ordinary people can also check whether sunglasses have UV protection.Take a piece of money, put the sunglasses lens on the anti-counterfeiting watermark, and use a banknote detector or a banknote detector to shine on the lenses. If you can see the watermark, it means that this pair of sunglasses is not anti-ultraviolet. If you can't see it, it means that this pair of sunglasses is anti-ultraviolet.
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