How can you tell if sunglasses are polarized?
In the previous article, we discussed “Are Costa sunglasses better than Oakley?”. In this article, let’s talk about “How can you tell if sunglasses are polarized?”.
Characteristics of Polarized Lenses
Although polarized lenses can filter out much irregular light interference and avoid the occurrence of blinding and dazzling phenomena, if the arc bending of the lens itself cannot show the optical standard refractive state, the polarized light effect will be weakened, affecting the image authenticity. And the durability of the lens is poor. Due to the instability of arc bending, the lens is deformed, which directly leads to the poor clarity of the translucent junction, image distortion. And they can not have a normal visual effect. And the surface is easy to scratch and wear, not durable. Polarized lenses are composed of layers of thin resin material pressed together.(https://www.koalaeye.com/collections/polarized-sunglasses)
Polarized Light Test Card
A polarized lens will be equipped with a polarized test card. Through the polarized lenses, we can see the normal light invisible images. The sharper the image contour, the better the quality of the polarized lens. Glasses shops generally have special discrimination of polarized lens identification board. Wearing polarized lenses can see the pattern that your naked eye can not see. You can't see that pattern with regular sunglasses.
Liquid Crystal Display
Use an LCD screen and points the glasses horizontally at the screen. Rotate the sunglasses up 45 degrees clockwise. If the color of the lens changes and the color returns to normal when the sunglasses are rotated back to their original position, then the sunglasses can be judged to be polarized. If you can't see the change in lens color no matter how you turn it, then you can tell that the sunglasses are non-polarized.
Change of the Lens Color
If you have two pairs of polarized sunglasses, you can place them horizontally on top of each other so that an image of the object can be seen through the two pairs. Then rotate one of the sunglasses 90 degrees clockwise, and as you rotate, you can see the image darken noticeably. If this happens, both sunglasses are polarized sunglasses.
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