The difference between polarized glasses and sunglasses and the selection method

Now there are many sunglasses on the market, some will have the word polarized on the logo, many people will not understand what the difference between polarized sunglasses and non-polarized, in fact, their differences are mainly in their function, the following D&L to introduce you to it.


  1. The difference between polarized glasses and sunglasses

Difference in Principle

Polarized lenses are manufactured according to the principle of polarization of light. Polarized light, also known as polarized light, visible light is a transverse wave, whose direction of vibration is perpendicular to the direction of propagation. The direction of vibration of natural light is arbitrary in the plane perpendicular to the direction of propagation. For polarized light, its direction of vibration is limited to a specific direction at a given instant. In life, in addition to sunlight and ultraviolet light,, light passing through uneven surfaces such as roads and water will produce irregular diffuse light, commonly known as “glare”. The appearance of glare can cause eye discomfort, fatigue, and affect the clarity of vision. Ordinary sunglasses can only reduce the intensity of light, can not effectively remove the bright surface reflections and glare in all directions, while polarized lenses in addition to UV protection and reduce the intensity of light, but also can effectively filter out the glare.

Sunglasses, also known as sun shades. Commonly used to shield the sun and ultraviolet tinted glasses. People in the sun usually rely on adjusting the size of the pupil to adjust the amount of light flux, when the intensity of light exceeds the ability of the human eye to adjust, it will cause damage to the human eye. Sunglasses can block the uncomfortable glare and protect the eyes from UV rays. So in outdoor places, especially in the summer, many people use sun shades to block the sun to reduce eye regulation caused by fatigue or bright light stimulation caused by injury.

2、The difference in material

The general polarized sunglasses on the market are made of fiber laminated polarized film. It is different from the optical glass polarized sunglasses, because of its soft texture, arc bending instability, lens assembly on the frame, the lens is difficult to achieve optical refraction standards, visual image loose, deformation. Due to the arc bending instability, resulting in lens deformation, it directly leads to poor clarity of its light transmission image, image distortion, can not play the normal effect of light. And the surface is easy to scratch and wear. Not durable.


However, different people, according to their preferences and different uses to choose sunglasses, to reduce the bright light stimulation, clear vision without distortion, UV protection, color recognition without distortion, accurate identification of traffic signals is the basic function of sunglasses.


3, the difference in the use of


Polarized sunglasses because of its ability to block out 100% of harmful light, it is mainly used in.


1, medical: eye surgery patients, need a full range of protection, polarized sunglasses is the best choice.


2, outdoor activities: such as skiing, fishing, water activities, etc., all need sunglasses that can completely block harmful light to avoid eye injury or fatigue.


3, also suitable for driving, travel, daily wear.


The biggest advantage of sunglasses in general is their popularity. Sunglasses are not only needed in the summer, they are actually required all year round. You need to wear them on sunny days and also on cloudy days. Don’t think that the sun is not strong on cloudy days, and the weather is not hot, so you should not take it lightly, but unknowingly irradiate more harmful UV rays. So even if it’s a cloudy day, you must still refer to the UV index forecast and be prepared to protect yourself from the sun.



  1. the selection of polarized sunglasses

1、 UV (degree of UV protection)

UV standard means: the human eye perception of light range is 380 ~ 780nm (i.e. visible light), ultraviolet is the wavelength of light below 380nm (invisible light). UV380 means that it can effectively block the wavelength of light below 380nm. And UV400 standard because at the same time also blocked part of the visible light, so will lose part of the color.


2、 Polarized light (polarized light, polarization-suppressed light)


Color saturation, so that the outline of the object becomes blurred, so that eye fatigue, discomfort. Polarizer is made according to the principle of polarization of light, that is, when the plane of vibration of light and the axis of polarization are parallel, the polarized light filter can make polarized light through (as the principle of blinds). Thus, the light is organized into the same direction of light into the human eye, so that the surrounding scenery looks clear and not harsh. Another outstanding advantage is that the lenses are extremely light, thin (thickness 0.8mm, 1.1mm) and impact resistant, so they are ideal for driving and outdoor activities, and have become popular in recent years.



  1. the skills to buy sunglasses

1, first observe the lens whether there are scratches, impurities, bubbles, stripes, check the outer packaging of sunglasses, regular sunglasses should be marked with the name, color, diameter, quality level, production plant name and trademark, mirror or hangtag on the sunglasses with anti-UVA, UVB and CE mark to ensure that the blocking of certain ultraviolet rays.


2, hold the two corners of the sunglasses against the fluorescent light, so that the mirror reflective strip rolling gently, if you find the mirror reflective fluorescent shadow appears wavy, distorted, proving that the lens is not flat, such a mirror will damage vision.


3, the lens should be flat, high clarity, sun lens material has glass and resin, and the best sun lenses should be polarized lenses. Polarized lenses can effectively filter out reflected light and harmful ultraviolet rays, and has the function of anti-shattering, anti-abrasion, etc., is the most popular sunglasses.


4, the color of sunglasses in addition to their skin color, face shape, wearing to match, should also be based on access to the place to choose. Generally speaking, black, teal, gray light filtering effect is good: gray lenses on any color spectrum can be balanced absorption, see the scene after wearing the mirror will only darken without significant color difference; teal lenses can filter out a lot of blue light, can improve visual contrast and clarity, in serious air pollution or foggy situation with the effect is particularly good.


5, choose the right color shades for us. Simple self-test method is to wear sunglasses in the mirror, to vaguely see their pupils as the limit. The color is too light is too small filtering effect; color is too dark is affecting vision and weaken the sense of color. In water activities at the beach, in the snow with strong reflections and under the sun with very strong sunlight, you should wear sports sunglasses.


Post time: Jul-29-2021

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