How to distinguish the differences between polarized and non-polarized sunglasses
Sunglasses are a must-have summer accessory for many people. A pair of sunglasses will make you look more stylish whether you are at the beach or going for a field trip. And now, many of the famous brands will highlight their polarizing characteristics in the product promotion, and polarizing seems to be a unique selling point of the product is beginning to be known. So what's the differences between polarized and non-polarized sunglasses? And how can we tell if sunglasses are polarized?
In general, there are two big basic functions with the polarized sunglasses, one is keeping out strong light, and the other one is filtering ultraviolet ray. The efficiency of the non-polarized filters ultraviolet ray is inferior. But do you know that in our daily life? Not only strong light and ultraviolet light, but also the light passing through uneven roads, water surfaces will also produce irregular diffused light, which will blur the vision of the human eye.
Polarized sunglasses can filter out this kind of light and only absorb the reflected light of the object itself, so that the things you see present a lifelike scene, and make the field of vision clearer and less fatigued. In addition, due to its high-efficiency filter layer, the blocking rate of polarized sunglasses to ultraviolet rays reaches 99%, which can effectively reduce the damage of ultraviolet rays to the eyes.
There is no difference in appearance between polarized sunglasses and non-polarized sunglasses, but ordinary sunglasses mainly play a role in reducing glare and ultraviolet intensity. Because their lenses cannot filter light, they cannot completely block these harmful rays. Its main function is to reduce damage to the eyes.
Due to the nature of polarized light, polarized sunglasses can completely block the glare caused by scattering, bending, reflection and other factors. It can completely block ultraviolet rays that are harmful to human eyes, so that people can work for a long time under strong light, and the eyes are not easy to fatigue, things can be seen more clearly and three-dimensionally.
What is "polarized"?
The polarized is made according to the principle of polarization of light. As we know When the sun shines on the road or water, it will directly irritate the eyes, making people feel dazzling, tired, and unable to look at things for a long time. Especially when you are driving or participating in outdoor activities, polarized light will not only affect our work and entertainment mood, but also affect our judgment of objects and cause danger; Long-term direct exposure to the sun will cause a rapid decline in vision, resulting in nearsightedness, hyperopia, astigmatism or cataracts.
The special function of the polarizer is to effectively remove and filter the scattered light in the beam. Light can enter the visual image of the eye on the right axis, making the vision clear and natural. Just like the principle of venetian blinds, the scattered light is adjusted to enter the room in the same direction, making the scenery soft and not dazzling.
What are the features of polarized sunglasses?
1. The filtering performance must meet the requirements of international standards, and it can filter more than 99% of the ultraviolet rays in the sun.
2. Effective blocking of strong light
3. The lens adopts a standard optical arc bending design to form a visual axis to produce an image
4.The frame is firm, the frame material is excellent, and the optical function design makes it comfortable and safe to wear.
How to distinguish Polarized sunglasses?
1. Two polarized lenses are stacked vertically. If there is no light, it means that it is polarized lens. Since the polarized lens is specially designed to allow only parallel light to pass through the lens, when two lenses are stacked vertically, most of the light will be blocked. At the time of purchase, with such a simple operation, you can immediately know whether the product is a polarized one.
2, Use a polarizer to identify the test card. The hidden image cannot be seen by the naked eye, but can be seen by using a polarizer. If it’s not a Polaroid lens, you can’t see the hidden image either.
3,Use the mobile phone to identify the polarizer, choose a picture on the mobile phone, and when ordinary sunglasses are rotated on the mobile phone screen, there is no change when viewing the mobile phone screen through the sunglasses. However, if that is a polarizer, through the lens, you can see that the phone screen becomes brighter and darker. The light and shadow changes are obvious.
What is the main use of polarized sunglasses?
The main purpose of wearing polarized sunglasses is to protect the eyes from damage under certain conditions. It can effectively filter harmful stray light and has a great eye protection effect. Generally speaking, the use of ordinary sunglasses can meet the shading requirements.
Especially when driving, you need to use a polarizer, because driving often encounters a variety of dazzling light. Polarized sunglasses can block and filter out the light reflected from the ground, making the field of vision more clearer, relieving visual fatigue, and benefiting safe driving.
Why should we wear polarized sunglasses?
The damage of ultraviolet rays to the human body is "cumulative." The longer the exposure to the sun, the damage of ultraviolet rays will increase.There is a statistical report in the United States that 80% of the ultraviolet radiation that a person receives in his life is accumulated by exposure to the sun before the age of 18, so it is necessary to avoid ultraviolet rays from an early age
Of course, in order to avoid the damage of ultraviolet rays to the eyes, we should minimize exposure to strong sunlight, especially between 10 am and 2 pm, when the sun's rays directly hit the surface of the earth, cause at that time, the ultraviolet intensity is the highest. The light reflect from cement, snow, beaches, and water are the strongest light and damage the eyes the most, but they are also the easiest to be ignored.Therefore, if you want to spend a long time in these areas, be sure to wear appropriate polarized sunglasses.
A word of caution: Sunglasses aren't just for summer, they're actually necessary all year round. It can be used in sunny or cloudy days. Do not think cloudy day sunlight is not strong, the weather is not hot, take it lightly, ultraviolet ray can not pass temperature discretion light intensity to judge. Therefore, even if the cloudy day, you still have to refer to the UV index forecast and prepare for sun protection!
