Coating is to coat a layer of substance on the lens, which has different functions. Some anti-ultraviolet films can increase the transparency of lenses and make them clearer. From the appearance, the coated eye lenses are all a little colored, blue or pink, and their functions are similar. The price of film mulching is ten to tens of dollars, but I personally think it is best to film mulching. Of course, when the price difference is not too big, it is generally more than ten dollars, and it is not more than twenty. I suggest you choose. In order to improve the transmittance of light after passing through the optical system of the lens, a film is usually crossed over the lens. Red movies are designed to change the vision of traditional yellow phenomenon. Green film is a more advanced and complex film system than blue film and red film. The passband of antireflection is wider and flatter, and the valley of antireflection is in the center of visible spectrum (so it appears green). From the use point of view, the contrast and color reproduction of green film mirror are better than others.
See how the spectrum distinguishes whether the filter material is blue glass or white glass.
Blue glass can generally filter out infrared light, which is reflected in the spectrum, that is, it will absorb light with a wavelength greater than 780nm; White glass, on the other hand, can maintain a certain penetration for infrared light; So we can distinguish the material of glass from the absorption of infrared part. Please refer to.
Of course, if white glass is coated, it can also filter out infrared light.
Fuxiang optics
What are blue lenses?
Blue light is an invisible light wave, which is a short wave in the spectrum. It can penetrate the cornea and lens to reach the retina, causing damage to the retina and increasing the prevalence of macular degeneration. But don't care too much. People with normal vision without glasses are usually exposed to the sun. You got it? Just a selling point. For macular degeneration and IT professionals who face video terminals for a long time, it can be considered. Don't be fooled by exaggeration. The quality of the lens mainly depends on these parameters. High light transmittance, high precision, stable film performance and small antireflection. Easy to clean and wear-resistant is the soul of the lens, and it is the hard index of the lens. Others are the selling points of businesses. Radiation protection, ultraviolet protection and anti-fatigue are all selling points. Choosing the right lenses for different people is a perfect match. Just like if you don't put 400 horsepower in Santana, it's boring and can't show its performance. It is recommended to buy lenses from international brands such as Zeiss Su Na Teflon. It is recommended to buy high-end lenses in China. The low-end ones are not durable, and all brands are similar. I don't understand. I hope it helps you.
Is it better to coat resin glasses with blue film or green film? What's the difference and function?
At present, there are several kinds of lens coatings, such as green film, blue film and purple film. Generally speaking, blue film and green film lenses can increase the comfort of eyes and have a good effect on protecting eyes. In addition, the higher the refractive index, the thinner the lens and the better the light transmittance. At present, the refractive index of glasses on the market is divided into 1.74, 1.70, 1.67, 1.60 and so on. ...
The lenses are gold film, red film, blue film and green film. What is the difference?
Generally speaking, the coating on the lens surface itself is colorless and transparent. Only the light that does not pass through the lens will be reflected back, forming a reflection visible to the human eye. The more light passes through the lens, the weaker the reflection. For uncoated lenses, the light transmittance is low, the surface reflection of the lens is serious, and all kinds of light in the spectrum are strongly reflected, so the comprehensive color of reflection is white light; The reflection of single-layer coated lens on the lens surface is weak, which greatly increases the yellow-green light transmittance in the middle of the spectrum, and only the red light and blue light at both ends of the spectrum are reflected, so the reflection is generally light blue-purple; The light transmittance of multilayer coated lenses is extremely high, and the direct reflection on the lens surface is weak. According to the characteristics of mirror films from different manufacturers, this reflection can be divided into crimson (blue light), dark blue (red light), dark yellow (blue-green) and green. Green coating can increase the transmittance of blue light and red light at both ends of the spectrum, and only the yellow-green light in the middle of the spectrum is reflected back, so the transmittance curve of this antireflection film is red and green.
The color of the coating depends on the optical materials and design requirements. The thinner the coating, the smaller the reflection, the better. Commonly used are blue film and red film. Blue film is a traditional coating, and red film appeared in the first half of last century. Under normal circumstances, the blue film is excellent (many famous cameras and camera lenses are coated with blue film, which is why).
How to tell which kind of coated glasses lens is? Are yellow and green the best? What are the representative brands? There are a lot of problems
Is there a film to see if the reflection of the lens has color? If there is color in the reflection, there is a coating. Generally, myopia lenses are yellow-green films, and the absorption spectra of different films are different. The yellow-green film in daily life is enough. When you look at computers, they are generally blue film ... brands, imported ones like Zeiss and Essilor. There are many domestic ones that are brand new and bright. ...
What is the meaning of ESPF 15 on glasses lens?
Hello, this is a concept of the company, which has an anti-ultraviolet coefficient, and the lenses are anti-ultraviolet on both sides. The front adopts reflection method, and the inner surface of the lens is plated with patented spectrum technology, which consumes ultraviolet energy. In this way, the ultraviolet protection effect is higher than that of ordinary lenses. 15 means 15 times, the company has 25 lenses, and the company has acquired other companies except 65438+.
Anti-reflection film of coated lens
Anti-reflection film uses the interference principle to make the light passing through the film cancel each other and achieve the purpose of anti-reflection film. The antireflection film can reduce the reflection loss of light energy on the lens surface and improve the imaging intensity and resolution. In order to meet the requirements of low reflection in a wide spectral range, three or more antireflection films are needed. At present, the thickness of multilayer antireflection films is about 0.3μm, and most of them are made of high-purity metal oxide materials such as titanium oxide and zirconium oxide, which are plated on the surface of resin lenses by evaporation process to achieve good antireflection effect. After antireflection coating, there will be residual color, mostly green. For lenses that need hardening, hardening treatment should be carried out first, and then antireflection film should be plated.