How to Tell if Sunglasses Are Polarized

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To make sure that you're getting the product you paid for and that it's up to safety standards, you can test the lenses of your sunglasses to see if they really are polarized. The anti-glare technology in the lenses, which shields your eyes from the sun, has unique qualities that are very different from non-polarized lenses. To see whether or not your sunglasses are polarized, test the lenses by using a reflective surface, looking at a computer screen, or comparing your pair very carefully to another one.

Method 1
Method 1 of 3:

Testing on a Reflective Surface

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  1. You could use a reflective tabletop, a mirror, or other shiny, flat surface. Make sure the glare is noticeable even from about 2 to 3 feet (60 to 90 cm) away. [1]
    • If you need to produce glare, you can turn on overhead lights or shine a flashlight on a reflective surface.
  2. You should be able to view the surface through one of the lenses at a time. Depending on the size of the lenses in your sunglasses, you might need to move them a little closer to your face.
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  3. Your sunglasses should be on an angle at this point, with one of the lenses raised slightly higher than the other. Since sunglasses are polarized in a specific direction, rotating the sunglasses can make the polarization more effective. [2]
    • Depending on how the glare is hitting the surface, you might have to slightly adjust the angle of the glasses to see a noticeable difference.
  4. If the sunglasses are polarized, you will notice the glare disappears. When you look through one of the lenses, it should be very dark and you should see little to no glare, but it will still look like the light is shining on the surface. [3]
    • Move the sunglasses to compare your regular eyesight to what you see through the sunglasses a few times if you’re unsure of the effectiveness of the polarization.
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Method 2
Method 2 of 3:

Comparing Two Pairs of Sunglasses

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  1. If you already have a pair of sunglasses that are polarized, or are at a store with multiple pairs of polarized sunglasses, you can do a comparison test. The test is only effective with another pair of polarized sunglasses. [4]
  2. Align the lenses in your eyeline, making sure they’re about 1 to 2 inches (2.5 to 5.1 cm) apart. You’ll want the questionable pair of sunglasses to be closest to you, and the polarized pair to be farther away. [5]
    • Make sure the lenses don’t touch each other, as this can cause scratches on the coating.
  3. This will help make the test a little easier, especially if it’s your first time comparing sunglasses this way. The light will make the shading more distinct. [6]
    • You can use natural light coming in from a window or artificial light like overhead lighting or a lamp.
  4. One of the lenses should be diagonal from the other lens, and the polarized sunglasses should stay in the same position. Only one of the lenses will still be aligned with the other pair. [7]
    • It doesn’t matter which way you rotate the sunglasses, but make sure you hold both pairs of lenses steady.
  5. If both pairs of sunglasses are polarized, the overlapping lenses will appear to be darker when you look at them straight on. If the questionable pair isn’t polarized, there won’t be a difference in color. [8]
    • You can compare the overlapping lenses to the color of the lenses that aren’t overlapping.
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Method 3
Method 3 of 3:

Using Your Computer Screen

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  1. Most electronics have the same anti-glare technology as polarized glasses. You’ll be able to test the polarization by looking at the screen. [9]
    • Open a white screen, because the brightness will make the effect of the test more prominent.
  2. Once you’re in front of the computer, just put the sunglasses on like you’d normally wear them. Make sure you’re sitting directly in front of the screen. [10]
    • It might be helpful to elevate your computer screen to eye level if it isn’t already positioned there.
  3. While you’re in front of the screen, tilt the top of your head to the left or right side of your body. If the sunglasses are polarized, the screen will appear to turn black due to the anti-glare properties cancelling each other out. [11]
    • If one side doesn’t work, try tilting your head to the other side. If that doesn’t work, the sunglasses are not polarized.
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      • If possible, test the polarization of your sunglasses before purchasing them. Some stores will have polarization test cards that have images only visible when using polarized sunglasses.
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      References

      1. ↑ https://store.yeelight.com/blogs/everything-about-lights/what-does-glare-mean-lighting
      2. ↑ https://healthfully.com/tell-sunglasses-polarized-5888626.html
      3. ↑ https://www.aao.org/eye-health/glasses-contacts/polarized-lenses
      4. ↑ https://www.exploratorium.edu/snacks/polarized-sunglasses
      5. ↑ https://www.exploratorium.edu/snacks/polarized-sunglasses
      6. ↑ https://www.exploratorium.edu/snacks/polarized-sunglasses
      7. ↑ https://www.exploratorium.edu/snacks/polarized-sunglasses
      8. ↑ https://www.exploratorium.edu/snacks/polarized-sunglasses
      9. ↑ https://healthfully.com/tell-sunglasses-polarized-5888626.html
      1. ↑ https://healthfully.com/tell-sunglasses-polarized-5888626.html
      2. ↑ https://healthfully.com/tell-sunglasses-polarized-5888626.html

      About This Article

      Article Summary X

      If you aren’t sure how to tell if your sunglasses are polarized, find a reflective surface that produces glare, like a mirror or a reflective tabletop. Hold your glasses about 6-8 inches in front of your eyes and tilt them at a 60° angle. Look through the lens and check the level of the glare. If the sunglasses are polarized, you will notice that the glare disappears. Keep reading to learn how to compare 2 pairs of sunglasses!

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