What are polarized sunglasses? Why should we use it? Let's go through the article below to find out. Glare is oriental light that shines in one direction and into the eye beyond eye control. Glare from reflected sunlight or oncoming cars at night is usually dangerous. It causes eyestrain, headache, blurring vision, and color distortion. When exposed to blinding glare, as a natural response, you try to focus and squint. These actions usually lead to discomfort, eye pain, and low visibility. These phenomena happen when you are wearing UV sunglasses. UV sunglasses are designed to block solar radiation only, not for glare. On the contrary, besides providing full UV protection, polarized sunglasses can block annoying glare to enhance your vision in flat places or water environments.
How is glare created?
Natural light from the sun is present everywhere around us, even on overcast days. When it encounters a smooth object, it becomes polarization in which natural light transforms into vertical light and horizontal light. Vertical light is not harmful, but horizontal light is known as a glare to reduce visibility and cause eyestrain. Polarized lenses have a chemical filter applied to the lens surfaces. This chemical filter acts as a smart gate to let the beneficial light go through while blocking harmful glare. Thus when wearing polarized shades, you will experience comfort, better visibility, and true color perception.
Benefits of wearing polarized lenses
- Driving: help reduce glare and hallucinations. Hence drivers see the road clearly and safely drive.
- Outdoor sports: reduce eyestrain, improve visual clarity. Hence sports enthusiasts can maximize performance.
- Fishing: help anglers see above and beyond the water surface, even the fish hiding underneath the water.
- Beach sightseeing: help beach tourists enjoy the beauty of the beach landscape without eyestrain.
Disadvantages of wearing polarized lenses
- Polarized lenses have the same polarizing technique as liquid crystal displays. Thus you can not wear polarized shades to read instructions from LCD.
- When viewed through polarized lenses, the snow and the ice have the same white color. That means skiers can not notice which place is dangerous to avoid an accident.
How to identify polarized sunglasses?
- Checking the letter "P" printed on the sunglass lenses.
- Checking the word " polarized" printed on the left temple.
- Using a polarized tester. The blurred image on the polarized tester becomes clear and sharp when viewed through polarized sunglasses.
- Using a computer screen or your phone: place your shades in front of the computer screen with direction appear as you are wearing them. The image on your lenses will turn darker when you turn your glasses 90 degrees.