What kind of lens material is better?
The lens is actually a piece of glass or a transparent object, through which we can observe some things and feel that things are very clear, large or small. It has five types: colored lenses, painted lenses, polarized lenses, color-changing lenses, and anti-reflective protective lenses. What kind of lens material is better?
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According to the material classification, the lens can be divided into: glass lens material, natural lens material, lens material, resin lens material. Let us understand the characteristics and advantages and disadvantages of these lens materials.
- Glass lens:
Lenses of this material are more scratch-resistant than other lenses and are relatively darker. High refractive index lens is the performance of using this material lens, mainly adding Tio2 and pb0 in the lens.
Advantages: higher clarity and higher hardness
Disadvantages: The difference in color image is relatively large, which can easily cause the peripheral vision to be reduced, the peripheral lines bend, and colors appear.
- Natural lenses:
The lens of this material is finely ground quartz, the main component is silicon dioxide (Sio2), pure crystal contains 100% of Sio2.
Advantages: material hardness is relatively large, not easy to wear
Disadvantages: can not completely absorb the ultraviolet rays of the sun, nor can it reduce the transmittance of infrared rays.
- PC lens:
The material of this lens is solid, and the main component is polycarbonate, which is a thermoplastic material. Lenses can only be formed after heating, so this kind of lens has very strong toughness and is not easy to break, so it is called a safety lens. It is only 2 grams per cubic centimeter, which is currently the lightest material used for lenses.
Advantages: light, safe, suitable for making frameless glasses, because they are not easy to break
Disadvantages: difficult to process.
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- Resin lenses:
The material of this lens is liquid, which is a high-quality lens material widely used at present.
Advantages: light weight, reducing the pressure when wearing the glasses, making the wearing more comfortable. It is impact resistant, not easy to break, and the lens can form an obtuse angle even after it is broken. The absorption of ultraviolet rays is much stronger than that of glass lenses, especially when anti-ultraviolet elements are added. The thermal conductivity is low, preventing the lens from fogging.
Disadvantages: The lens of this material has poor abrasion resistance, is easy to scratch, and the refractive index is relatively low.
Each lens material has its own advantages and disadvantages, and people in different situations use different lens materials. However, when buying lenses, you must choose relatively high-quality materials to avoid unnecessary damage to your eyes.
Cyxus blue light blocking glasses adopted high quality PC lens, which is safe, scratch-proof and filter harmful blue light from digital screen.