Are pc lenses okay? PC films are also known as 'space films' and 'cosmic films'. When you hear this name, you know that their materials are unusual. Compared with traditional lenses, PC lenses have many advantages. That's why pc lenses are more expensive, and PC lenses are suitable for a variety of people. Let's take a look at pc lenses together.
The advantages of PC lenses
1. The weight of PC lenses is very light, which is lighter than common resin lenses 37 %, can relieve the pressure of the lens on the bridge of the nose. And the lens is very thin.
2. Good impact resistance. Everyone is familiar with resin lenses, which have better impact resistance, but the impact resistance of PC lenses is far greater than that of resin lenses. PC lenses are 10 times stronger than traditional resin lenses and 60 times stronger than glass lenses. They are the most impact-resistant lenses in the world. The thickened material is commonly known as bulletproof glass.
3. Effective anti-ultraviolet rays. The material of the PC lens itself has the function of UV protection, so whether it is coated or uncoated, it has the function of UV protection, while other lenses need to be coated to prevent UV. It can prevent eye diseases such as cataracts.
4. PC lenses are suitable for children, athletes, police officers, drivers and other people.
5. PC lenses are not easy to turn yellow. Ordinary resin lenses are prone to yellowing.
6. The surface of the PC lens is very smooth, which can reduce the internal scattering of the lens and reduce the damage of light to the retina.
Disadvantages of PC lens optical lens
If the PC lens is heated, the lens is easy to deform; the dispersion of the PC lens is larger, The Abbe number has reached 33.0; specific technology is required for lens processing. Generally, PC lenses need to be coated with a scratch-resistant protective film for better results; special edging equipment is required to grind, dry grinding in the front part and wet in the back part. The requirements for grinding are relatively high, and the price of PC lenses is relatively expensive.
Outdoor eyeglass lens selection Precautions for outdoor lens purchase
Gray lens, which can absorb any color spectrum evenly , Therefore, viewing the scene will only darken, but there will be no obvious chromatic aberration, showing a real and natural feeling. It belongs to the neutral color system.
brown lenses filter out a large amount of blue light, which can improve visual contrast and clarity. It is better to wear the focus lens under severe air pollution or foggy conditions.
The green lens absorbs light while maximizing the green light reaching the eyes, so it has a cool and comfortable feeling, suitable for people who are prone to eye fatigue.
Blue-gray lenses, similar to gray lenses, belong to neutral lenses, but with darker colors and higher visible light absorption.
The surface of the mercury lens adopts a high-density mirror coating. Such lenses absorb more reflected visible light and are suitable for outdoor sports people.
Yellow lens, strictly speaking, this kind of lens is not a sunglass lens, because it hardly reduces visible light, but in foggy and dusk, yellow lens can improve the contrast. Provide more accurate vision, so it is also called aspherical night vision goggles. Some young people wear 'sunglasses' with yellow lenses as decoration.
Light blue, light pink and other lenses are also more decorative than practical lenses.
The shade of the lens only affects the visible light absorption performance, and has nothing to do with the ability to resist ultraviolet rays, because ultraviolet rays are not Visible light and UV resistance are determined by the lens material, not the depth of the color. Some resin sheets are colorless and transparent, but they are still 100% UV resistant.
Some sunglasses are made of progressive color resin lenses, that is, the upper depth is lighter and the lower is light, until they are close to colorless. Such sunglasses can be worn outdoors and can block the sunlight from the upper and the front. You can still look close in or in the car. If the light-colored progressive color is worn by middle-aged women, it will have a good decorative effect.