Most people have heard of the reading sunglasses, retro sunglasses, antique sunglasses, but do you know what polarized sunglasses are. First invented in 1936 by Edwin Land, they have a relatively short history. These specially made lenses are widely used to resist the solar glare. At present, there are two types of polarized sunglasses: one is coated with a protective substance and the other has a filter enclosed within it. Both of the two can resist unwanted portion of sunlight.
While most people recognize the benefits of polarized lenses, their principle is widely unknown. The basic principle is that they can restrict waves of light in one direction, not all around. We know sunlight will be either absorbed by object or reflected, and the latter does more contribution than the frontier. Typically, 99% of unwanted reflection can be blocked.
Because of their unique design, polarized sunglasses are largely needed during outdoor activities, like skiing, snowboarding, fishing and so forth. These glasses are particularly helpful for fishermen, because sun reflection in their eyes can affect their eyesight into the water. People can wear the polarized sunglasses not only in summer but also in winter.
Now that the polarized sunglasses are specially designed and can be both worn in summer and winter, there is a great market and an increase in price. And there are many unqualified maker manufacturing them to make profits. Inexperienced buyers may be the victims. Remember one principle to differentiate replicas from authentic polarized sunglasses is to rotate them. If the light passing through the lens changes intensity, the lens is forged. It is wise to choose qualified polarized sunglasses, rather than a cheap pair.
To fight against the UV rays, sunglasses lenses should play an important role. We may think that how much UV rays filtered depend on the color of lenses. But you get wrong. It is the special coating on the outer surface of sunglass lenses that filters the UV rays, rather than lens color. Long-term exposure to UV rays can be quite harmful. The most important aspect to choose sunglasses is the amount of UV protection. Those with 99% to 100% UV protection are competent. Then, think about the price and color for the protection of your eyes.
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