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How to Tell if Sunglasses Are Polarized Download Article Co-authored by Alexander Knezevic, MD
Last Updated: July 8, 2025 Fact Checked
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Testing on a Reflective Surface
|
Comparing Two Pairs of Sunglasses
|
Using Your Computer Screen
|
Video
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Tips
|Show more|Show less X
This article was co-authored by Alexander Knezevic, MD. Dr. Alexander Knezevic is an Ophthalmologist at the Macy Eye Center in Los Angeles, California. He also is Medical Staff at Cedars-Sinai Medical Center and is a Clinical Instructor of Ophthalmology at UCLA. He graduated with his Doctor of Medicine degree from the University of Nebraska Medical Center, and he completed his Residency at the McGaw Medical Center of Northwestern University. Dr. Knezevic did his Fellowship at the University of California-Irvine, and he’s board certified by the American Board of Ophthalmology. Additionally, Healthgrades has awarded him their Honor Roll award. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 491,049 times.
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.[1]XResearch source
Steps
Method 1 Method 1 of 3:
Testing on a Reflective Surface
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1 Find a reflective surface that produces glare when light is shining on it. You could use a reflective tabletop, a mirror, or other shiny, flat surface.[2]X Expert Source Alexander Knezevic, MDOphthalmologistExpert Interview Make sure the glare is noticeable even from about 2 to 3 feet (60 to 90 cm) away.[3]XResearch source
If you need to produce glare, you can turn on overhead lights or shine a flashlight on a reflective surface.
2 Hold your sunglasses about 6 to 8 inches (15 to 20 cm) in front of your eyes. You should be able to view the surface through one of the lenses at a time.[4]X Expert Source Alexander Knezevic, MDOphthalmologistExpert Interview Depending on the size of the lenses in your sunglasses, you might need to move them a little closer to your face. Advertisement
3 Rotate the sunglasses upwards to a 60 degree angle. 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.[5]X Expert Source Alexander Knezevic, MDOphthalmologistExpert Interview [6]XResearch source
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 Look through the lens and check the level of glare. 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.[7]X Trustworthy Source American Academy of OpthamologistsProfessional medical organization focused on advocating for public health and supporting sight-related research Go to source
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.
Advertisement Method 2 Method 2 of 3:
Comparing Two Pairs of Sunglasses
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1 Locate a pair of sunglasses that you know are polarized. 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.[8]XResearch source
2 Hold the polarized pair of sunglasses out and the other pair in front of them. 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.[9]XResearch source
Make sure the lenses don’t touch each other, as this can cause scratches on the coating.
3 Position the sunglasses in front of a bright light for more dramatic results. 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.[10]XResearch source
You can use natural light coming in from a window or artificial light like overhead lighting or a lamp.
4 Rotate the questionable sunglasses by 60 degrees. 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.[11]XResearch source
It doesn’t matter which way you rotate the sunglasses, but make sure you hold both pairs of lenses steady.
5 Look at the overlapping section of the lenses to see if it’s darker. 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.[12]XResearch source
You can compare the overlapping lenses to the color of the lenses that aren’t overlapping.
Advertisement Method 3 Method 3 of 3:
Using Your Computer Screen
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1 Turn your computer screen to its brightest setting. Most electronics have the same anti-glare technology as polarized glasses. You’ll be able to test the polarization by looking at the screen.[13]XResearch source
Open a white screen, because the brightness will make the effect of the test more prominent.
2 Put on your sunglasses. 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.[14]XResearch source
It might be helpful to elevate your computer screen to eye level if it isn’t already positioned there.
3 Tilt your head 60 degrees to the left or right. 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.[15]XResearch source
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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Tips
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. Thanks Helpful 11 Not Helpful 7
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Co-authored by: Alexander Knezevic, MD Ophthalmologist This article was co-authored by Alexander Knezevic, MD. Dr. Alexander Knezevic is an Ophthalmologist at the Macy Eye Center in Los Angeles, California. He also is Medical Staff at Cedars-Sinai Medical Center and is a Clinical Instructor of Ophthalmology at UCLA. He graduated with his Doctor of Medicine degree from the University of Nebraska Medical Center, and he completed his Residency at the McGaw Medical Center of Northwestern University. Dr. Knezevic did his Fellowship at the University of California-Irvine, and he’s board certified by the American Board of Ophthalmology. Additionally, Healthgrades has awarded him their Honor Roll award. This article has been viewed 491,049 times. 40 votes - 85% Co-authors: 17Updated: July 8, 2025 Views: 491,049 Categories: Featured Articles | SunglassesArticle SummaryX
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!Did this summary help you?YesNo
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Yes No Advertisement Cookies make wikiHow better. By continuing to use our site, you agree to our cookie policy. Co-authored by: Alexander Knezevic, MD Ophthalmologist Co-authors: 17Updated: July 8, 2025 Views: 491,04985% of readers found this article helpful. 40 votes - 85% Click a star to add your vote
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Download Article Co-authored by Alexander Knezevic, MD 
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Co-authored by: Alexander Knezevic, MD Ophthalmologist This article was co-authored by Alexander Knezevic, MD. Dr. Alexander Knezevic is an Ophthalmologist at the Macy Eye Center in Los Angeles, California. He also is Medical Staff at Cedars-Sinai Medical Center and is a Clinical Instructor of Ophthalmology at UCLA. He graduated with his Doctor of Medicine degree from the University of Nebraska Medical Center, and he completed his Residency at the McGaw Medical Center of Northwestern University. Dr. Knezevic did his Fellowship at the University of California-Irvine, and he’s board certified by the American Board of Ophthalmology. Additionally, Healthgrades has awarded him their Honor Roll award. This article has been viewed 491,049 times. 40 votes - 85% Co-authors: 17 Updated: July 8, 2025 Views: 491,049 Categories: Featured Articles | Sunglasses Article SummaryX
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1 Find a reflective surface that produces glare when light is shining on it. You could use a reflective tabletop, a mirror, or other shiny, flat surface.[2] Make sure the glare is noticeable even from about 2 to 3 feet (60 to 90 cm) away.[3] 
2 Hold your sunglasses about 6 to 8 inches (15 to 20 cm) in front of your eyes. You should be able to view the surface through one of the lenses at a time.[4] Depending on the size of the lenses in your sunglasses, you might need to move them a little closer to your face. Advertisement 
3 Rotate the sunglasses upwards to a 60 degree angle. 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.[5] [6] 
4 Look through the lens and check the level of glare. 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.[7] 
1 Locate a pair of sunglasses that you know are polarized. 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.[8] 
2 Hold the polarized pair of sunglasses out and the other pair in front of them. 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.[9] 
3 Position the sunglasses in front of a bright light for more dramatic results. 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.[10] 
4 Rotate the questionable sunglasses by 60 degrees. 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.[11] 
5 Look at the overlapping section of the lenses to see if it’s darker. 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.[12] 
1 Turn your computer screen to its brightest setting. Most electronics have the same anti-glare technology as polarized glasses. You’ll be able to test the polarization by looking at the screen.[13] 
2 Put on your sunglasses. 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.[14] 
3 Tilt your head 60 degrees to the left or right. 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.[15] 
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