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How to judge the resin lens
Publisher:Xiangtaihao Chemical  Release Time:2020-03-06 14:38:39  Browse Times: Second
How to judge the resin lens  1. See if the light transmittance is good, and see if there are any bubble impurities in it.  2. Look at the hardness of the lens. Due to the low hardness, the resin lens itself must undergo a strict surface hardening treatment before it leaves the factory to meet the wear resistance requirements of wear. Otherwise, the surface of the lens is usually rubbed after wearing for two or three months. 'It is more serious, and can not even be worn, and the wear resistance of resin lenses with qualified hardness is much better, and there are only a few scratches after wearing for several months, and it does not affect the wear.  3. Looking at the color, the high-quality resin lenses have no background color (if the coating lens is coated with color), while the background color of the inferior lens is slightly blue, and it is easy to yellow after wearing for a period of time.  4. The center thickness of inferior resin lenses is relatively thin, and the edges appear to be thinner than lenses with the same refractive index. This sacrifice of center thickness to make lenses thinner is wrong, because resin lenses are different from glass lenses and are called To make a "safety lens", the minimum thickness of the center is required. Wearing such lenses is at the expense of the safety of your eyes.  If you can't accurately identify the inferior resin lenses, then you'd better go to a large reputable glasses shop to get resin lenses.  Buying resin lenses  Resin lenses have been popular in China since 1996 and now, after more than 10 years of market promotion, they have occupied more than 85% of the market share. More and more people have started to use this safe and lightweight lens. However, in actual work, we found that many friends have little knowledge of resin sheets. After purchasing lenses, they do not know the brand, refractive index, film type, application skills, and lens life of their lenses.  I. Brand  What a brand is is a product that is widely recognized by everyone and widely praised by the industry and customers in the retail market. The quality of these lenses can reach A grade, of course, the price is also the highest. A 1.56 refractive index coated lens is also at least 500 yuan or more. In Europe and the United States, it is a popular lens. In China, a few people will choose Luxury. So what about domestic brands, in fact, many of the brands mentioned above are domestically produced, and many of the packagings are made in China, so don't blindly import imported lenses. Many materials for domestic products rely on imports from Japan and South Korea. The internal testing standards of the company are divided into A, B, and C grades. Class A is generally used for export or for first-tier brand OEMs. Class B is usually used by manufacturers to sell their brands directly to retail stores for sale. The quality and price are very good. Such as 1.56 lenses, 100-200 products in the retail market. C-level generally enters the wholesale market, supplying scattered customers and customers in remote areas, and the price is cheap. Many small retail shops in big cities have special packages and what special discounts of 100 yuan frames and lenses are basically this type of products.  In summary, first-tier brands have high prices and naturally high quality grades. Domestic brands can buy products above the B-level, which is also a cost-effective choice. C-level lenses, let alone.  Second, the refractive index  The material purchase parameters of the lens are based on the refractive index, which determines the price of the lens. The following is a list and brief description of the refractive index. We only talk about domestic brand lenses above the B level.  1.50 (1.499) the most common resin lens on the market, the refractive index is relatively low, the highest myopia can reach 600 degrees, if the frame is larger, the lens edge is thicker. The price ranges from 50-200, which is suitable for elementary and middle school students. The degree often changes and the lens needs to be changed. The price is relatively cheap.  1.56 (1.556) resin lenses that are relatively popular at present, medium refractive index, commonly known as ultra-thin, but now, they should be called medium refractive lenses, which can routinely reach 800 degrees of myopia. Prices range from 100-500, it is recommended for customers within 800 degrees.  1.61 (1.607) this can be called super thin, domestic brands retail in the range of 300-600, the thickness is a lot thinner than the previous two. Recommended within 1000 degrees.  1.67 (1.667) is now called ultra-thin lenses, ranging from 600-1000 retail, and can reach 1500 degrees, 500-600 myopia friends should use this lens, it should be a good choice, I use it This refractive index lens has an aspheric design, which is very comfortable and expensive. (The lens is imported lens OEM, and few are made in China.) It is recommended for customers within 1200 degrees.  1.74 (1.735) is currently the thinnest lens, aspherical design, starting at 1,000 yuan, all imported domestic brands. The pursuit of beauty, beauty, and high-quality people can use it up to 2000 degrees, and it is recommended for people within 1500 degrees.  Third, the type of film  Generally common lenses are divided into substrate (no film lens, used for dyeing, very non-wearable), hard film (silicide film, transparent and colorless, difficult to distinguish), green film (fluoride, increase light transmission Properties), purple film (metal ion film, which takes into account both light transmission and shielding of high-frequency radiation, the film itself has conductivity and shielding function). As long as it is a lens with a color film, the light transmittance can reach more than 97%. Hardened film is mainly used for customers with poor working environment and poor care. The lens is not easy to be scratched and has a long life. However, the light transmission is only 88%. (It is reflected that the user can see the back object from the inside of the lens, and the surface will reflect light when taking pictures).  Fourth, the use of maintenance skills and lens life  The advantages of resin lenses are light and not easy to break. The disadvantage is that they are not wear-resistant. The cities we live in are full of dust and oil secreted from the human face. If we do not pay attention to maintenance, the lenses will be damaged within half a year. The correct method is to rinse the dust on the front and back surfaces of the lens with tap water, and then evenly apply the detergent to the surface of the lens, and then rinse it off with water. The remaining water on the lens is blotted with tissue paper. Generally, lens 2 Just clean once a day.  Can I use it without scratch lenses? The processing of resin lenses is made by curing liquefied monomers at high temperatures or ultraviolet rays. As the life cycle becomes longer and the environment and temperature change, the film layer on the lens surface and the material of the lens itself will undergo physical changes. The film layer will look under a microscope. The unevenness of the material changes, the local luminosity of the material itself is not the same as when it is matched, resulting in light scattering, reduced comfort, and the symptoms of dryness and swelling of the eyes when used for a long time. At this time, you should replace the lens The time is about one and a half to two years. 发送反馈 历史记录

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