How do you know whether your sunglasses are polarized or not without going to the optician? One way to solve is to look at a reflection of an object through the sunglasses. Then, turn the glasses clockwise or anticlockwise, whichever your prefer. If there are no changes in the intensity of the reflection, brace yourself because your glasses are not polarized.
What are the differences between polarized sunglasses and dark sunglasses? Normal dark glasses decrease the same amount if light intensity. However, polarized lenses can eliminate even the reflection of light from the water surface.
Maximum polarization occurs when the sun is at 37 degrees from the sphere. It would not be of much help in filtering when the sun is too low or too high. Polarized lenses are a big help for drivers. This is because the bright reflection from the car ahead or opposite you reflects the light which causes bright glare. This light usually comes in horizontally, which is perfect for polarized lens as they are in vertical. The theory behind this is that for instance, the surface which you look in front of you is slanting to your side. At the mean time, the sun is aligned above the two cars. However, if the sun is behind you, the reflected light will be almost perpendicular to our vision which will not cause polarization of the light.
This eyewear is partly suitable for skiing and non-water sport activities. First of all, the snow glare is not able to polarized, thus it won’t help much. The theory explained above applies to non-water sports too where the angle of the sun plays an important role in our vision.
One must get the facts about polarized sunglasses right to avoid any future misunderstanding. More information can be obtained from the opticians themselves, books as well as from the internet.
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