Sunglasses lens material classification

1. Glass lens

Glass lenses are what we often come into contact with. The most prominent advantage of glass lenses is that their optical performance is very stable. This is the consistent advantage of glass lenses. It is the same when used in frame glasses. Under the pressure of the frame. The disadvantage of glass lenses is that they are easily broken, which can easily cause damage to the eyes. At present, the newly developed strengthened glass lens has much more outstanding performance than ordinary glass lenses, and is also regarded as a kind of safety lens.

2. Polarized lens

This is a lens used in polarized sunglasses. It uses the polarization principle of light to block glare from all sides from the lens, making the line of sight clearer and safer when driving. In 1937, Edwinland Bausch & Lomb of the United States invented this kind of lens, and then it was widely used in polarized sunglasses. He also took the opportunity to create his own Polaroid company.

3. Color-changing lenses

Also known as photosensitive lenses, the color of the lens will change due to the change of light, so that the eyes can adapt to different environments. Under strong light, the color of the color-changing lens will deepen, and under dark light, the color of the lens will automatically become lighter. . This type of lens has been used in myopia sunglasses, and this form of photochromic lenses is also considered to be the most convenient and beautiful type of myopia sunglasses, more popular than the clip-on type.

4. Plastic lens

This is a material that many sunglasses brands like to use. Its most obvious feature is that it is light and unbreakable. The anti-ultraviolet function of plastic lenses without any treatment is significantly better than that of glass lenses, and the color processing of plastic lenses is also simpler. . The disadvantage of plastic lenses is their wear resistance, which is easy to scratch, and the lenses are easily deformed when they are hit, so be more careful about their maintenance.

At present, there are mainly three kinds of plastic lens materials, namely resin lens, PC lens, and acrylic lens.

5. 5.resin material sunglasses lens

Friends who often wear glasses must have heard of resin lenses, but what exactly are resin lenses? Resin (CR-39) is actually a chemical substance with a phenolic structure, which is extracted from phenolic components in petroleum, and is characterized by light weight , High temperature resistance, strong impact resistance, can effectively block ultraviolet rays and other functions. The great advantage of resin lenses used in sunglasses is their easy tinting properties. Many fashionable sunglasses use the properties of resin lenses that are conducive to tinting. However, resin lenses have poor toughness and are not resistant to impact. This type of sunglasses is widely used and has a strong decorative effect, making it a good choice for fashionistas.

6. PC material sunglasses lens

PC refers to polycarbonate, which is a kind of plastic (PC for short), which is a macromolecular polymer containing carbonate groups in the molecular chain. PC material lenses are simply plastic sunglasses lenses. This material also has High and low end. It is characterized by lightness and good coloring properties, but its disadvantages are low wear resistance and unstable optical properties. PC material sunglasses are more suitable for sports people and drivers.

7. AC lens (acrylic lens)

It has excellent toughness, high transmittance, good fog resistance, low cost, brittle material, and may have brittle chips when broken, and the stability of optical indicators is average.

8. Nylon sunglasses lenses

Nylon sunglasses are mostly used in sports brand sunglasses and high-quality big-name sunglasses. They have high elasticity, excellent optical quality, and strong impact resistance. When nylon lenses were invented, they were used as eye protection glasses. Professional protection function. However, nylon lenses have poor wear resistance and high production costs. This type of sunglasses is more suitable for people who use sports or professional protective glasses.

9. TAC material sunglasses lens

TAC sunglasses lenses are widely used in China. TAC (Triacetyl Cellulose) has a very complex composition and is one of the polymer materials with high penetration. As a sun lens, TAC has the characteristics of acid and alkali resistance, light and thin texture, and high cost performance. However, the poor wear resistance has become the soft foot of TAC lenses, and there are other disadvantages.

Too stable optical characteristics is also the reason why TAC lenses are eventually abandoned by most well-known brands at home and abroad despite their low prices.