method 1
to find an LCD screen. The easiest way is to find a mobile phone and face the phone screen horizontally. When the glasses rotate in front of the screen, the screen becomes light and dark. This is polarized lens . If it does not change no matter how it rotates, it is not polarized lens .
Method 2
This is the easiest method: stack the two polarized lenses vertically, and opaque to the sunlight lenses will appear. If they are transmissive, at least one pair is not polarized lenses. The reason is that the polarizer lens is specially designed to allow parallel light to pass through the lens, and most of the light is blocked when the two lenses are stacked vertically.
So when purchasing, with such a simple operation, you can immediately know the authenticity and quality of the product.
Glasses stores generally have identification boards that specialize in identifying polarizers
Wearing a polarizer can see patterns that you don’t see with your naked eyes, and wearing ordinary sunglasses can’t see that pattern.
UV400 means 100% blocking ultraviolet rays
The sunglasses on the market may not necessarily have the effect of isolating ultraviolet rays. If you want to know whether the lens can isolate ultraviolet rays: Find an ultraviolet ray banknote detection lamp, or banknote detection pen, a hundred yuan. You can see the 100 yuan UV anti-counterfeiting protection by directly illuminating the RMB. If the lens with UV400 function is separated, there is no anti-counterfeiting.
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