Anti-ultraviolet glasses are protective glasses that achieve protective effects by adding chemicals to the lenses to absorb them. They are frequently used daily. There are many types of UV-resistant glasses, and the materials used are not the same. Let's start with a comparison of materials.
1. Natural materials
The most commonly used is the crystal lens. The advantage is that the material has high hardness and is not easy to wear. Disadvantages: Can not completely absorb short-wave ultraviolet rays; can not salt and reduce the transmittance of infrared rays; material density is not uniform, if there are miscellaneous tributes, streaks and bubbles will appear, causing birefringence, which affects vision.
2, glass material
The main component is silica, followed by boron trioxide and phosphorus pentoxide. Advantages: good hardness, disadvantages: heavy and heavy, the specific gravity is double the resin material. As the refractive index increases, the specific gravity increases significantly, resulting in uncomfortable wearing: poor impact resistance, mechanical damage is likely to cause eye damage, so the safety is poor.
3, PC lens
PC is a kind of plastic. Polycarbonate is a polymer with a carbonate group in the molecular chain. In fact, it is a plastic lens. However, this lens also has good or bad points.咱 Professional athletes use high-end products, not a few pieces of plastic sheet products. Its characteristics are very light, good coloring and low price. Disadvantages are poor wear resistance and unstable optical properties.
4, resin materials
The main component is organic matter. Advantages: light and light, good impact resistance and safer. Resin materials used in imported French brands, almost all major foreign brands use resin materials as sunglasses lenses.
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