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How To Find Out If Your Sunglasses Are Genuinely Polarized

Posted on 25 August 2016


What is so special about polarized lens? Polarized lens reduces glare and oncoming sunlight through the sunglasses. All of our wooden frame sunglasses have polarized lenses with UV400 protection in our sunglasses store. The UV400 blocks all wavelengths up to 400 nanometers including UVA and UVB light.

There are a couple of ways to test out if our sunglasses are polarized or not:

First Method

Take your sunglasses and put them up against an LCD screen. Turn your sunglasses at an angle until you see the sunglasses turning black. 

Watch Video: Polarized Lens Test Against LCD screen

Second Method

Grab another sunglasses that you know is polarized. Hold the Knock On Wood sunglasses perpendicular to the other sunglasses. The same black effect should appear.

Watch Video: Polarized Lens Test Against Another Sunglasses

The video below is a test of our own sunglasses. First sunglasses is a classical Ray Ban polarized sunglasses. Second sunglasses is our own Knock On Wood polarized lenses. Third sunglasses does not have polarized lenses.


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  • Sarah Cole: October 13, 2016

    Oh okay, I tried this on my LCD computer screen and it works! Thank you

  • Knock On Wood Team: October 13, 2016

    Hi Sarah, this test does not work on iPhones because iPhones do no have an LCD screen. The screen on the iPhone is made of anodized aluminum. Most computer screens and televisions are LCD. If you have sunglasses that you know are polarized, then you can do that method.

    -Knock On Wood Team

  • Sarah Cole: October 13, 2016

    I tried this on my iphone and doesn’t work. Are my sunglasses not polarized?

  • Jane Murphy: October 13, 2016

    Very cool!

  • Darren Robertson: October 13, 2016

    This is a cool test I’ve known for awhile. I also use this method when buying polarized sunglasses.

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