Your daily practice is to wear sunglasses every time going out, but you still struggle with an irritating glare. Think about purchasing a pair of polarized sunglasses. Wearing sunglasses with polarized lenses built-in, people will get many benefits like enhancing visual clarity and reducing squinting, eyestrain. Besides that, polarized lenses provide a high level of UV protection as UV shades. The question that comes up is how you identify if the lenses are polarized?
What are activities that benefit from wearing polarized lenses?
Polarized lenses are a high-performance feature which makes the file comfortable and enjoyable for outdoor activities or adventures like fishing, boating, water sport, beach sightseeing, biking, car driving. They are not only eliminating the dangerous glare but also improve vision clarity and make the images clearer and sharper in bright sunlight, especially in water environments.
In case you already owned a loved one, and you do not know or remember whether or not your lenses are polarized. Here is a simple guide to testing your glasses to see what they really are.
Checking label, temples and lenses
Most polarized sunglasses come with a polarized sticker that sticks on the lens surface when you are buying sunglasses online or at a store. You will also recognize the word "polarized" printed on the left temple following the model number. Some high-end brands even print or etch the letter "P" on one of the corners of the lens.
Identify polarized lenses by letter "P" printed on the left lens
Using a polarized tester
Some eyewear manufacturers provide a polarized tester together with your glasses. The image on the polarized tester is blurring when viewing with naked eyes, whereas the image will become sharp and clear when viewing through polarized lenses. If the image still blurring after wearing your glasses and you can not determine what is image on the tester, your glasses are not definitely polarized.
Testing with a computer
The polarized lenses use similar technology in reducing glare as display devices. Place your glasses in front of the computer screen with temples facing you. When viewing through the polarized lenses, the image will turn black if you rotate your glassed 45 degrees. This magic test proves evidence that your sunglasses are polarized. You can do the same test for other devices like a tablet, cell phone.
Viewing at open water, lake, beach, river.
Water is the most reflective place, especially when the sun angle is low. Polarized lenses offer optimal performance in reducing the annoying glare reflecting off the water surface. If you can see objects on the water surface or beneath, that is proof to tell polarized lenses are built-in into your glasses to help you see past surface glare. Without wearing polarized glasses or with regular shades, images from the surroundings of the water surface are usually blurring, and you may experience eyestrain or headache since glare permeating through your eyes.
Comparison to other polarized sunglases
If you already owned a pair that you know for sure is polarized, you now want to figure out the second pair of glasses you just purchased is polarized or not. The simple way to do is to place two pairs of glasses 2 inches apart in positions so that the lenses are parallel, and you can view through two lenses. Then turn one pair around 90 degrees. Your new sunglasses are polarized if you notice the overlapping area turns darker. Otherwise, your new sunglasses are not polarized, in case you do not see any difference.
Remove your lenses
Remove two lenses from your frame and place them in front of you around 1-2 inches apart so that they are parallel. (use a screwdriver to remove lenses if your glasses are made from metal and pop lens out if your glasses are from plastic).
Then rotate one lens around 90 degrees. If you notice your lenses become darker, then your shades are polarized since both polarized lenses cancel light each other. If nothing happens, your sunglasses are not polarized.
Testing with snow and ice
If you are lucky to have snow and ice around in wintertime, you can do a simple test on your glasses. After wearing your shades, you can not tell the differences between the snow and the ice. It's sure your glasses are polarized.