What is the best material for polarized lenses
The polarizers are made of resin polarizers and glass polarizers.
1. Advantages of resin polarizers
(1) Light weight.
(2) Not easy to break: If the lens is broken, not only the fragments are less, but also less sharp, which can minimize the injury to the eyeball and face.
(3) Can be dyed: resin lenses are easy to dye, and can be appropriately matched with clothing and fashion.
(4) Can block ultraviolet rays: almost completely block ultraviolet rays with a wavelength below 350mm, the effect is far better than that of glass lenses.
(5) Strong anti-fogging property: Because the thermal conductivity of resin lens is lower than that of glass, it is not easy to cause blurring due to steam and hot water, and even if blurring occurs, it will disappear quickly.
(6) Anti-dent: Generally, high-heat and small-volume substances are likely to cause dents and spots on the glass sheet, but if it touches the resin lens, it will automatically bounce, and will not cause any damage on the surface of the lens. any trace.
(7) The surface reflection of the resin lens is lower than that of ordinary glass sheets, and it is also less dazzling.
(8) The resin bifocal lens has no chromatic aberration. This is because the resin bifocal lens is a whole-piece structure, so there is less chromatic aberration than the fused glass bifocal lens.
(9) The resin lens has a very wide range of resistance to chemicals and solvents, and almost all household solvents and chemicals will not affect or damage it.
2. Resin Disadvantages of polarizers
(1) Easy to scratch: The scratch resistance of resin lenses is worse than that of glass lenses, but it can be improved by surface hardening treatment, but the effect is limited.
(2) It is easy to deform when framing: This is because the density of plastic lenses is lower than that of glass lenses.
(3) Not resistant to high temperature: Although the resin is a thermosetting material, once a multi-layer film is plated, the surface of the multi-layer film may crack due to high temperature.
3. Advantages of glass polarizers
(1) High hardness: the surface is not easy to be scratched, and is more wear-resistant than resin sheets.
(2) High density: the film will not be deformed when loaded, which will affect its polarizing effect due to improper loading. The resin sheet has a smaller density, and its willfulness is much stronger than that of the glass sheet. If the film is improperly installed, or the shape of the glasses itself is not very consistent, it will deform and affect the polarizing effect.
(3) Strong light transmittance: The light transmittance of the glass sheet is generally stronger than that of the resin sheet, and the clarity is stronger.
4. Disadvantages of glass polarizers
(1) Heavy weight: Because its density is much larger than that of resin sheets, glass glasses are generally more expensive than resin sheets Glasses are heavy.
(2) Fragile: As we all know, glass is fragile. Therefore, its just-hitting ability is poor.
(3) Expensive: The polishing technology of polarized glass sheets is high, and the production process is more troublesome, so the general glass polarizers are used for middle and high-end glasses.
Principle of polarizers
A polarized lens is a lens that only allows light in a specific polarization direction in natural light to pass through. We all know that light travels in a straight line, which is the particle nature of light; at the same time, light also propagates in the form of waves, which is the wave nature of light, so light is also called light wave. Light waves have vibration in all directions, and polarizers take advantage of this wave of light.
The core of the polarizer is the polarizing film. The polarizing film is a dichroic transparent film, which allows the light in the direction parallel to the transmission axis to pass through, while the light perpendicular to this direction is absorbed. This phenomenon is called polarization of light. The light that passes through is light in the same vibration direction and is called polarized light. The reflected light is absorbed because the light becomes perpendicular to the transmission axis of the polarizing film after being reflected. Polarizers use this principle to effectively eliminate strong reflected light and scattered light, making the light softer, so that people can see the scenery naturally and clearly. Polarizers can also effectively absorb 99 percent of UVA and UVB, protecting the eyes well. It is the first choice for driving, fishing
, skiing, tourism, etc.
But polarizers are not perspective lenses. When you buy polarizers, there will be a test piece with some pictures in it, which you can see as long as you put on the polarizer. In fact, this test piece is specially made. It uses the principle of polarization to make the polarizer see the parallel light emitted by the picture inside, so that you can see the picture hidden inside. Methods. Now some manufacturers have produced mahjong tiles with the principle of polarized light, and the image of parallel light is embedded in the back of the tile. As long as you wear a polarizer, you can know what tile it is from the back of the tile!
How to identify the quality of polarized lenses
1. Under normal circumstances, polarized sunglasses have obvious electrostatic labels of polarized lens materials on the lenses. , or the use of polarized lenses is indicated on the product tag.
2. When purchasing polarized sunglasses, you can use a polarized test piece for testing. Part of the pattern on the test piece cannot be recognized by the naked eye, but can be clearly recognized through polarized lenses.
3. According to the display principle of the LCD screen, observe the LCD screen of the mobile phone through the polarized lens. When the screen is rotated, the screen will also become a black screen with the rotation, because the polarizer filter Caused by light from a single direction on the screen.
The pros and cons of lenses are the determinants of the quality of a pair of glasses, so consumers must be careful when purchasing lenses. Glass lenses are wear-resistant, but relatively speaking, they are heavier than lenses of other materials and are easily broken. Polymer resin lens: This lens is lighter in weight than glass lens, impact-resistant, not easy to break, but has low hardness, so it is easy to fluff and scratches.
Declare: The above methods are derived from the program system index or shared by netizens. They are for your reference only and do not represent the research views of this website. sex and authority.