Polarized light means using the principle of reflection to avoid light, and UV protection avoids UV radiation. However, ultraviolet light is a type of light. But there is a certain difference between the two. Many people think that polarized light is UV protection. This statement is wrong. But many people do not know, so what is the difference between polarized light and UV protection?
What Is UV Protection Sunglasses
There are three types of light emitted by sunlight: visible light, infrared light, and ultraviolet light.
Among them, ultraviolet rays cause serious damage to human skin, eyes, etc.
The ultraviolet rays in the light released by sunlight are divided into UVA, UVB, and UVC. If exposed to the sun for a long time, it will cause damage to the body. UVB seriously impacts vision and is the light that burns the skin. Most of the corners of the eyes will absorb this kind of UVB light. Therefore, this light source must be blocked.
Because anti-ultraviolet glasses have the function of polarizing light, they can block all harmful light without affecting the transmission of visible light, which can truly protect the eyes. The reason why sunglasses can block ultraviolet rays is that a special coating is added to the lenses. While blocking and absorbing ultraviolet rays, it also blocks part of the visible light, reducing the lenses’ transmittance. Therefore, high-quality sunglasses have a strong ability to block ultraviolet rays, the transmittance does not decrease much, and the coating film has a certain hardness and is not easy to wear.
Advantages Of UV-Rated Sunglasses
Wearing sunglasses in summer when the sun is strong can block the dazzling light and protect the eyes from ultraviolet rays, which is also a fashion.
The standard unit of UV protection for glasses with UV protection; is UV. UV is the abbreviation of English Ultraviolet Rays (ultraviolet rays). Ultraviolet light belongs to invisible light (also known as electromagnetic radiation), and the wavelength of ultraviolet light is below 400 nm in the spectrum. Glasses with a UV400 rating mean 100% UV protection.
To distinguish whether a pair of sunglasses has the function of UV protection, you can see obvious signs such as “UV protection” and “UV400″ on the labels or lenses of some products.” UV index” is the effect of filtering out ultraviolet rays, which is an important criterion for purchasing sunglasses. The UV index of most sunglasses is between 96%-98%. Sunglasses marked as “UV400” can protect against more than 90% of ultraviolet rays. The lenses are specially processed to block ultraviolet rays with wavelengths less than 400 nm.
What does Polarized Sunglasses Mean
Polarized sunglasses are a type of sunglasses are a relatively high-end category of sunglasses. Polarizers have a function that ordinary sunglasses do not have.
This function effectively blocks and filters out all kinds of polarized light that are harmful to the eyes.
Polarizers are lenses made according to the principle of the polarization of light, which can polarize light. A good polarizer can achieve the color of the surrounding environment without distortion, and the object’s edge is clear. It can effectively identify signal lights of different colors and reduce the effect of ultraviolet rays irradiating the pupil. Polarizers are like blinds, which only block part of the light, still let the light (including ultraviolet rays) parallel to the polarization angle, and the shielding rate is less than 50%. From the perspective of protection, it is equivalent to adding a layer of soft yarn to the window, but it is only partially blocked.
The polarizer comprises 7 layers of materials, which conform to the national sun lens standard and UV400 ultraviolet standard and protect the eyes in an all-around way.
Polarized sunglasses add a metal powder filter device based on the sun’s meridian. This filter device can prevent UVB from entering the cornea so that it cannot be absorbed to achieve the effect of protecting the eyes. When the sun shines on the eyes, the metal powder filter device will absorb the UVB in the sunlight, reducing the damage. In addition to absorbing harmful sunlight, polarized sunglasses also use the principle of refraction to reflect harmful rays of sunlight to other places. With the blessing of the two methods, they can produce a good protective effect.
Benefits Of Polarized Sunglasses
Polarizers’ biggest advantage is blocking glare interference and making the visual effect clearer. The protection against ultraviolet rays is not as good as reflective sunglasses and color-changing mirrors.
Generally, sunglasses only use the effect of reducing light. Because they cannot filter light, they can only reduce the intensity of glare, UV light, etc. These harmful rays cannot be completely blocked. So its function is only to reduce eye damage. But the biggest advantage of available sunglasses is that they are popular.
The production process of polarized sunglasses is more advanced. It combines three methods to block ultraviolet rays in sunlight by reducing light intensity, absorbing harmful substances in ultraviolet rays, and reflecting part of the light. Good uv400 polarized sunglasses can achieve a full-blocking effect. The eyes will not be damaged under strong sunlight and can see more clearly. The effect is much better than ordinary sunglasses.
Do I Need UV Protection Sunglasses Or Polarized Sunglasses?
UV-blocking glasses are only for UV protection, while polarizers not only protect against UV rays but also prevent glare.
In daily life, there are many harmful rays. In addition to infrared and ultraviolet rays, there is also some irregular diffuse reflection light, commonly known as glare. For example, the reflected light generated when passing through puddles and the reflected light generated by other irregular objects are also irritating to the eyes and cannot be blocked by anti-ultraviolet glasses. The polarizer has a polarizing film on it, which can block this glare, so the function of the polarizer is more comprehensive.
In our environment, there are three kinds of light: direct, reflected, and diffused. Among them, diffused light is not usually perceived by us, but it is the most important kind of light that our eyes can see objects; Because direct light has a fixed light source (such as the sun), as long as we pay attention, it will not cause harm to our lives. If you go for a walk, ordinary UV Protection Sunglasses can fully meet your needs.
But whether you are driving or doing outdoor activities such as mountaineering or skiing, choosing a pair of polarized sunglasses will make you more relaxed and comfortable. Like a pair of fitover polarized sunglasses for fishing. The rearview mirror in front of the driver is an uncertain reflective light source. The water surface on the roadside or the smooth plane objects carried by passers-by can become the reflective light source. These reflected lights may cause trouble or even danger to the drivers. Polarized sunglasses are designed to filter out the reflected glare so that they can play a role in preventing dizziness.